Add pull request trigger to release drafter workflow

Author: xterao

.github/workflows/release-drafter.yml

@@ -4,11 +4,11 @@ on:
   push:
     branches:
       - main
+  pull_request:
   workflow_dispatch:
 
 jobs:
   update_release_draft:
-    if: ${{ !contains(github.head_ref, 'doc/changelog-update-') && startsWith(github.event.head_commit.message, 'Merge pull request') }}
     permissions:
       contents: write
       pull-requests: write
@@ -18,16 +18,30 @@ jobs:
       skip_job: ${{ steps.check.outputs.SKIP_JOB }}
 
     steps:
+      - name: Fetch Sources
+        uses: actions/checkout@v4
+
       - name: Check Commit Message
         id: check
         run: |
+          BRANCH_NAME=$(git rev-parse --abbrev-ref HEAD)
+          git pull origin "$BRANCH_NAME"
+          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
+            TARGET_SHA="${{ github.event.pull_request.head.sha }}"
+          else
+            TARGET_SHA="${{ github.sha }}"
+          fi
+
           # Define a regex pattern to match commit messages for changelog updates
           CHANGELOG_UPDATE_PATTERN="^Merge pull request #[0-9]+ from ${{ github.repository_owner }}/doc/changelog-update-.*$"
+          MESSAGE=$(git log --format=%B -n 1 "$TARGET_SHA")
           
-          if [[ "${{ github.event.head_commit.message }}" =~ $CHANGELOG_UPDATE_PATTERN ]]; then
+          if [[ "$MESSAGE" =~ $CHANGELOG_UPDATE_PATTERN ]]; then
             echo "This commit is not target. Skip the workflow."
             echo "SKIP_JOB=true" >> $GITHUB_OUTPUT
           else
+            echo "This commit is target."
+            echo "$MESSAGE"
             echo "SKIP_JOB=false" >> $GITHUB_OUTPUT
           fi
       - uses: release-drafter/release-drafter@v6
@@ -68,7 +82,6 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          ref: main
 
       - name: Setup Java
         uses: actions/setup-java@v4
@@ -103,6 +116,7 @@ jobs:
             echo "No changes to commit."
             exit 0
           fi
-          git commit -am "Update Version With Release Draft - $REPLACE_VERSION"
-          git push origin main
+          git commit -am "Update Version With Release Draft - $RELEASE_VERSION"
+          BRANCH_NAME=$(git rev-parse --abbrev-ref HEAD)
+          git push origin $BRANCH_NAME