Add netlify build script for gallery (#10253)

gallery/script/netlify_build_gallery

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+TARGET_LABEL="Needs gallery preview"
+
+if [[ "$NETLIFY" != "true" ]]; then
+  echo "This script can only be run on Netlify"
+  exit 1
+fi
+
+function createStatus() {
+  state="$1"
+  description="$2"
+  target_url="$3"
+  curl -X POST -H "Accept: application/vnd.github.v3+json" -H "Authorization: token $GITHUB_TOKEN" \
+    "https://api.github.com/repos/home-assistant/frontend/statuses/$COMMIT_REF" \
+    -d '{"state": "'"${state}"'", "context": "Netlify/Gallery Preview Build", "description": "'"$description"'", "target_url":  "'"$target_url"'"}'
+}
+
+
+if [[ "${PULL_REQUEST}" == "false" ]]; then
+  gulp build-gallery
+else
+  if [[ "$(curl -sSLf -H "Accept: application/vnd.github.v3+json" -H "Authorization: token $GITHUB_TOKEN" \
+    "https://api.github.com/repos/home-assistant/frontend/pulls/${REVIEW_ID}" | jq '.labels[].name' -r)" =~ "$TARGET_LABEL" ]]; then
+    createStatus "pending" "Building gallery preview" "$DEPLOY_URL"
+    gulp build-gallery
+    if [ $? -eq 0 ]; then
+      createStatus "success" "Build complete" "$DEPLOY_URL"
+    else
+      createStatus "error" "Build failed" "$DEPLOY_URL"
+    fi
+  else
+    createStatus "success" "Build was not requested by PR label"
+  fi
+fi