[ci] Fix contribution message workflow

Author: jovnc

.github/workflows/contribution-message.yml

@@ -1,35 +1,23 @@
-name: Post contribution message in pull request
+name: Collect PR metadata for contribution message
 on:
   pull_request:
     types: [opened, reopened]
 
-permissions:
-  contents: write
-  pull-requests: write
-
 jobs:
-  post_contribution_message:
+  collect_pr_metadata:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v6
-
-      - name: Setup Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: "3.13"
-
-      - name: Install dependencies
+      - name: Save PR metadata
         run: |
-          pip install requests PyGithub
+          mkdir -p pr-metadata
+          echo "${{ github.event.pull_request.number }}" > pr-metadata/pr_number
+          echo "${{ github.event.pull_request.user.login }}" > pr-metadata/commit_author
+          echo "${{ github.event.pull_request.head.repo.owner.login }}" > pr-metadata/fork_author
+          echo "${{ github.event.pull_request.head.repo.name }}" > pr-metadata/fork_repo
+          echo "${{ github.event.pull_request.head.ref }}" > pr-metadata/fork_branch
 
-      - name: Run post contribution message script
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          PR_NUMBER: ${{ github.event.pull_request.number }}
-          COMMIT_AUTHOR: ${{ github.event.pull_request.user.login }}
-          FORK_AUTHOR: ${{ github.event.pull_request.head.repo.owner.login }}
-          FORK_REPO: ${{ github.event.pull_request.head.repo.name }}
-          FORK_BRANCH: ${{ github.event.pull_request.head.ref }}
-        run: |
-          python scripts/post-contribution-message.py
+      - name: Upload PR metadata
+        uses: actions/upload-artifact@v4
+        with:
+          name: pr-metadata
+          path: pr-metadata/

.github/workflows/post-contribution-message.yml

@@ -0,0 +1,57 @@
+name: Post contribution message in pull request
+on:
+  workflow_run:
+    workflows: ["Collect PR metadata for contribution message"]
+    types:
+      - completed
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  post_contribution_message:
+    runs-on: ubuntu-latest
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success'
+    steps:
+      - name: Download PR metadata artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: pr-metadata
+          path: pr-metadata/
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+
+      - name: Read PR metadata
+        id: pr-metadata
+        run: |
+          echo "pr_number=$(cat pr-metadata/pr_number)" >> $GITHUB_OUTPUT
+          echo "commit_author=$(cat pr-metadata/commit_author)" >> $GITHUB_OUTPUT
+          echo "fork_author=$(cat pr-metadata/fork_author)" >> $GITHUB_OUTPUT
+          echo "fork_repo=$(cat pr-metadata/fork_repo)" >> $GITHUB_OUTPUT
+          echo "fork_branch=$(cat pr-metadata/fork_branch)" >> $GITHUB_OUTPUT
+
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install dependencies
+        run: |
+          pip install requests PyGithub
+
+      - name: Run post contribution message script
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ steps.pr-metadata.outputs.pr_number }}
+          COMMIT_AUTHOR: ${{ steps.pr-metadata.outputs.commit_author }}
+          FORK_AUTHOR: ${{ steps.pr-metadata.outputs.fork_author }}
+          FORK_REPO: ${{ steps.pr-metadata.outputs.fork_repo }}
+          FORK_BRANCH: ${{ steps.pr-metadata.outputs.fork_branch }}
+        run: |
+          python scripts/post-contribution-message.py