Don't upload multiple times to same artifact in build workflow

The build workflow produces binaries for a range of target hosts. This is done by using a job matrix in the GitHub
Actions workflow that produces each build in a parallel job. GitHub Actions workflow artifacts are used to transfer the
generated files between sequential jobs in the workflow. The "actions/upload-artifact" action is used for this purpose.

Previously, a single artifact was used for this purpose, with each of the parallel jobs uploading its own generated
files to that artifact. However, support for uploading multiple times to a single artifact was dropped in version 4.0.0
of the "actions/upload-artifact" action. So it is now necessary to use a dedicated artifact for each of the builds.
These can be downloaded in aggregate by using the artifact name globbing and merging features which were introduced in
version 4.1.0 of the "actions/download-artifact" action.

.github/workflows/build.yml

@@ -48,9 +48,9 @@ env:
   GO_VERSION: '1.21'
   # See: https://github.com/actions/setup-node/#readme
   NODE_VERSION: '18.17'
-  JOB_TRANSFER_ARTIFACT: build-artifacts
+  JOB_TRANSFER_ARTIFACT_PREFIX: build-artifacts-
   CHANGELOG_ARTIFACTS: changelog
-  STAGED_CHANNEL_FILES_ARTIFACT: staged-channel-files
+  STAGED_CHANNEL_FILE_ARTIFACT_PREFIX: staged-channel-file-
   BASE_BUILD_DATA: |
     - config:
         # Human identifier for the job.
@@ -68,6 +68,8 @@ env:
         certificate-extension: pfx
         # Container for windows cert signing
         certificate-container: INSTALLER_CERT_WINDOWS_CONTAINER
+        # Arbitrary identifier used to give the workflow artifact uploaded by each "build" matrix job a unique name.
+        job-transfer-artifact-suffix: Windows_64bit
         # Quoting on the value is required here to allow the same comparison expression syntax to be used for this
         # and the companion needs.select-targets.outputs.merge-channel-files property (output values always have string
         # type).
@@ -91,6 +93,7 @@ env:
           {
             \"image\": \"ghcr.io/arduino/arduino-ide/linux:main\"
           }
+        job-transfer-artifact-suffix: Linux_64bit
         mergeable-channel-file: 'false'
       artifacts:
         - path: '*Linux_64bit.zip'
@@ -107,6 +110,7 @@ env:
         certificate-secret: APPLE_SIGNING_CERTIFICATE_P12
         certificate-password-secret: KEYCHAIN_PASSWORD
         certificate-extension: p12
+        job-transfer-artifact-suffix: macOS_64bit
         mergeable-channel-file: 'true'
       artifacts:
         - path: '*macOS_64bit.dmg'
@@ -121,6 +125,7 @@ env:
         certificate-secret: APPLE_SIGNING_CERTIFICATE_P12
         certificate-password-secret: KEYCHAIN_PASSWORD
         certificate-extension: p12
+        job-transfer-artifact-suffix: macOS_arm64
         mergeable-channel-file: 'true'
       artifacts:
         - path: '*macOS_arm64.dmg'
@@ -233,7 +238,7 @@ jobs:
               ) | \
               yq \
                 --output-format json \
-                '[.[].artifacts.[]]'
+                'map(.artifacts[] + (.config | pick(["job-transfer-artifact-suffix"])))'
             )"
 
             # The build matrix produces two macOS jobs (x86 and ARM) so the "channel update info files"
@@ -252,7 +257,7 @@ jobs:
               echo "${{ env.BASE_BUILD_DATA }}" | \
               yq \
                 --output-format json \
-                '[.[].artifacts.[]]'
+                'map(.artifacts[] + (.config | pick(["job-transfer-artifact-suffix"])))'
             )"
 
             merge_channel_files="false"
@@ -417,13 +422,13 @@ jobs:
           matrix.config.mergeable-channel-file == 'true'
         with:
           if-no-files-found: error
-          name: ${{ env.STAGED_CHANNEL_FILES_ARTIFACT }}
+          name: ${{ env.STAGED_CHANNEL_FILE_ARTIFACT_PREFIX }}${{ matrix.config.job-transfer-artifact-suffix }}
           path: ${{ matrix.config.working-directory && format('{0}/{1}', matrix.config.working-directory, env.STAGED_CHANNEL_FILES_PATH) || env.STAGED_CHANNEL_FILES_PATH }}
 
-      - name: Upload [GitHub Actions]
+      - name: Upload builds to job transfer artifact
         uses: actions/upload-artifact@v4
         with:
-          name: ${{ env.JOB_TRANSFER_ARTIFACT }}
+          name: ${{ env.JOB_TRANSFER_ARTIFACT_PREFIX }}${{ matrix.config.job-transfer-artifact-suffix }}
           path: ${{ matrix.config.working-directory && format('{0}/{1}', matrix.config.working-directory, env.BUILD_ARTIFACTS_PATH) || env.BUILD_ARTIFACTS_PATH }}
 
       - name: Manual Clean up for self-hosted runners
@@ -449,16 +454,17 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Download staged-for-merge channel files artifact
+      - name: Download staged-for-merge channel file artifacts
         uses: actions/download-artifact@v4
         with:
-          name: ${{ env.STAGED_CHANNEL_FILES_ARTIFACT }}
+          merge-multiple: true
           path: ${{ env.CHANNEL_FILES_PATH }}
+          pattern: ${{ env.STAGED_CHANNEL_FILE_ARTIFACT_PREFIX }}*
 
-      - name: Remove no longer needed artifact
+      - name: Remove no longer needed artifacts
         uses: geekyeggo/delete-artifact@v5
         with:
-          name: ${{ env.STAGED_CHANNEL_FILES_ARTIFACT }}
+          name: ${{ env.STAGED_CHANNEL_FILE_ARTIFACT_PREFIX }}*
 
       - name: Install Node.js
         uses: actions/setup-node@v4
@@ -488,11 +494,11 @@ jobs:
               --channel "${{ needs.build-type-determination.outputs.channel-name }}" \
               --input "${{ env.CHANNEL_FILES_PATH }}"
 
-      - name: Upload merged channel files to job transfer artifact
+      - name: Upload merged channel files job transfer artifact
         uses: actions/upload-artifact@v4
         with:
           if-no-files-found: error
-          name: ${{ env.JOB_TRANSFER_ARTIFACT }}
+          name: ${{ env.JOB_TRANSFER_ARTIFACT_PREFIX }}channel-files
           path: ${{ env.CHANNEL_FILES_PATH }}
 
   artifacts:
@@ -503,22 +509,25 @@ jobs:
     if: always() && needs.build.result != 'skipped'
     runs-on: ubuntu-latest
 
+    env:
+      BUILD_ARTIFACTS_FOLDER: build-artifacts
+
     strategy:
       matrix:
         artifact: ${{ fromJson(needs.select-targets.outputs.artifact-matrix) }}
 
     steps:
-      - name: Download job transfer artifact
+      - name: Download job transfer artifact that contains ${{ matrix.artifact.name }} tester build
         uses: actions/download-artifact@v4
         with:
-          name: ${{ env.JOB_TRANSFER_ARTIFACT }}
+          name: ${{ env.JOB_TRANSFER_ARTIFACT_PREFIX }}${{ matrix.artifact.job-transfer-artifact-suffix }}
-          path: ${{ env.JOB_TRANSFER_ARTIFACT }}
+          path: ${{ env.BUILD_ARTIFACTS_FOLDER }}
 
       - name: Upload tester build artifact
         uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.artifact.name }}
-          path: ${{ env.JOB_TRANSFER_ARTIFACT }}/${{ matrix.artifact.path }}
+          path: ${{ env.BUILD_ARTIFACTS_FOLDER }}/${{ matrix.artifact.path }}
 
   changelog:
     needs:
@@ -561,11 +570,11 @@ jobs:
 
           echo "$BODY" > CHANGELOG.txt
 
-      - name: Upload Changelog [GitHub Actions]
+      - name: Upload changelog job transfer artifact
         if: needs.build-type-determination.outputs.is-nightly == 'true'
         uses: actions/upload-artifact@v4
         with:
-          name: ${{ env.JOB_TRANSFER_ARTIFACT }}
+          name: ${{ env.JOB_TRANSFER_ARTIFACT_PREFIX }}changelog
           path: CHANGELOG.txt
 
   publish:
@@ -584,18 +593,23 @@ jobs:
       needs.build-type-determination.outputs.publish-to-s3 == 'true' &&
       needs.build-type-determination.outputs.is-nightly == 'true'
     runs-on: ubuntu-latest
+
+    env:
+      ARTIFACTS_FOLDER: build-artifacts
+
     steps:
-      - name: Download [GitHub Actions]
+      - name: Download all job transfer artifacts
         uses: actions/download-artifact@v4
         with:
-          name: ${{ env.JOB_TRANSFER_ARTIFACT }}
+          merge-multiple: true
-          path: ${{ env.JOB_TRANSFER_ARTIFACT }}
+          path: ${{ env.ARTIFACTS_FOLDER }}
+          pattern: ${{ env.JOB_TRANSFER_ARTIFACT_PREFIX }}*
 
       - name: Publish Nightly [S3]
         uses: docker://plugins/s3
         env:
-          PLUGIN_SOURCE: '${{ env.JOB_TRANSFER_ARTIFACT }}/*'
+          PLUGIN_SOURCE: '${{ env.ARTIFACTS_FOLDER }}/*'
-          PLUGIN_STRIP_PREFIX: '${{ env.JOB_TRANSFER_ARTIFACT }}/'
+          PLUGIN_STRIP_PREFIX: '${{ env.ARTIFACTS_FOLDER }}/'
           PLUGIN_TARGET: '/arduino-ide/nightly'
           PLUGIN_BUCKET: ${{ secrets.DOWNLOADS_BUCKET }}
           AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
@@ -616,12 +630,17 @@ jobs:
       needs.changelog.result == 'success' &&
       needs.build-type-determination.outputs.is-release == 'true'
     runs-on: ubuntu-latest
+
+    env:
+      ARTIFACTS_FOLDER: build-artifacts
+
     steps:
-      - name: Download [GitHub Actions]
+      - name: Download all job transfer artifacts
         uses: actions/download-artifact@v4
         with:
-          name: ${{ env.JOB_TRANSFER_ARTIFACT }}
+          merge-multiple: true
-          path: ${{ env.JOB_TRANSFER_ARTIFACT }}
+          path: ${{ env.ARTIFACTS_FOLDER }}
+          pattern: ${{ env.JOB_TRANSFER_ARTIFACT_PREFIX }}*
 
       - name: Get Tag
         id: tag_name
@@ -633,7 +652,7 @@ jobs:
         with:
           repo_token: ${{ secrets.GITHUB_TOKEN }}
           release_name: ${{ steps.tag_name.outputs.TAG_NAME }}
-          file: ${{ env.JOB_TRANSFER_ARTIFACT }}/*
+          file: ${{ env.ARTIFACTS_FOLDER }}/*
           tag: ${{ github.ref }}
           file_glob: true
           body: ${{ needs.changelog.outputs.BODY }}
@@ -642,8 +661,8 @@ jobs:
         if: needs.build-type-determination.outputs.publish-to-s3 == 'true'
         uses: docker://plugins/s3
         env:
-          PLUGIN_SOURCE: '${{ env.JOB_TRANSFER_ARTIFACT }}/*'
+          PLUGIN_SOURCE: '${{ env.ARTIFACTS_FOLDER }}/*'
-          PLUGIN_STRIP_PREFIX: '${{ env.JOB_TRANSFER_ARTIFACT }}/'
+          PLUGIN_STRIP_PREFIX: '${{ env.ARTIFACTS_FOLDER }}/'
           PLUGIN_TARGET: '/arduino-ide'
           PLUGIN_BUCKET: ${{ secrets.DOWNLOADS_BUCKET }}
           AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
@@ -661,7 +680,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Remove unneeded job transfer artifact
+      - name: Remove unneeded job transfer artifacts
         uses: geekyeggo/delete-artifact@v5
         with:
-          name: ${{ env.JOB_TRANSFER_ARTIFACT }}
+          name: ${{ env.JOB_TRANSFER_ARTIFACT_PREFIX }}*