workflow refactor to used shared build file

.github/workflows/build.yml

@@ -1,6 +1,8 @@
-name: WLED CI
+name: WLED Build
 
-on: [push, pull_request]
+# Only included into other workflows
+on:
+  workflow_call:
   
 jobs:
 

.github/workflows/wled-ci.yml

@@ -0,0 +1,11 @@
+name: WLED CI
+
+on:
+  push:
+    branches:
+      - '*'
+  pull_request:
+
+jobs:
+  wled_build:
+    uses: ./.github/workflows/build.yml