Move PR message validation to a separate workflow

.github/workflows/message.yml

@@ -0,0 +1,25 @@
+name: Validate Commit Message
+
+on:
+  pull_request:
+    types: [opened, synchronize, edited]
+
+jobs:
+
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Validate Tag
+        run: |
+          TAG=$(echo ${{ github.event.pull_request.title }} | sed -ne 's/\[\(.*\)\].*/\1/p')
+          if grep -q "tag: \"\[$TAG\]\"" .codegen/changelog_config.yml; then 
+            echo "Valid tag found: [$TAG]"
+          else 
+            echo "Invalid or missing tag in commit message: [$TAG]" 
+            exit 1
+          fi

.github/workflows/push.yml

@@ -54,22 +54,3 @@ jobs:
         run: |
           # Exit with status code 1 if there are differences (i.e. unformatted files)
           git diff --exit-code
-
-  commit-message:
-    runs-on: ubuntu-latest
-    if: ${{ github.event_name == 'pull_request' }}
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
-
-      - name: Validate Tag
-        run: |
-          TAG=$(echo ${{ github.event.pull_request.title }} | sed -ne 's/\[\(.*\)\].*/\1/p')
-          if grep -q "tag: \"\[$TAG\]\"" .codegen/changelog_config.yml; then 
-            echo "Valid tag found: [$TAG]"
-          else 
-            echo "Invalid or missing tag in commit message: [$TAG]" 
-            exit 1
-          fi