fix(updater): Trigger CI for new PRs without changelog updates

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 ### Fixes
 
+- Updater - Trigger CI for new PRs without changelog updates ([#166](https://github.com/getsentry/github-workflows/pull/166))
 - Updater - Select the first branch when multiple branches point at `HEAD` ([#165](https://github.com/getsentry/github-workflows/pull/165))
 
 ### Dependencies

updater/action.yml

@@ -462,3 +462,32 @@ runs:
           Auto-generated by a [dependency updater](https://github.com/getsentry/github-workflows/blob/main/updater/action.yml).
           ${{ env.TARGET_CHANGELOG }}
         labels: dependencies
+
+    - name: Trigger PR workflows
+      if: ${{ (inputs.changelog-entry != 'true') && ( steps.create-pr.outputs.pull-request-operation == 'created' ) && ( steps.update.outputs.pull-request-head-sha == '' || steps.update.outputs.pull-request-head-sha == steps.create-pr.outputs.pull-request-head-sha ) }}
+      shell: bash
+      working-directory: caller-repo
+      env:
+        PR_BRANCH: ${{ steps.root.outputs.prBranch }}
+        PR_HEAD_SHA: ${{ steps.create-pr.outputs.pull-request-head-sha }}
+        API_TOKEN: ${{ inputs.api-token }}
+        SSH_KEY: ${{ inputs.ssh-key }}
+      run: |
+        git fetch origin "$PR_BRANCH"
+        git checkout --force -B "$PR_BRANCH" "origin/$PR_BRANCH"
+
+        current_head=$(git rev-parse HEAD)
+        if [ "$current_head" != "$PR_HEAD_SHA" ]; then
+          echo "::notice::PR branch changed from $PR_HEAD_SHA to $current_head; skipping synthetic CI trigger."
+          exit 0
+        fi
+
+        git config user.name "github-actions[bot]"
+        git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+        git commit --amend --no-edit
+
+        if [ -n "$API_TOKEN" ] && [ -z "$SSH_KEY" ]; then
+          git remote set-url origin "https://x-access-token:${API_TOKEN}@github.com/${{ github.repository }}.git"
+        fi
+
+        git push --force-with-lease="refs/heads/$PR_BRANCH:$PR_HEAD_SHA" origin "HEAD:refs/heads/$PR_BRANCH"