gha/ci: allow validate/all-done to succeed for non-PRs

When we run CI not on a pull request, the commit job is skipped, as a
result, all-done is also skipped.

To allow all-done to succeed, modify the commit job to succeed for
non-PRs.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

.github/workflows/validate.yml

@@ -157,22 +157,26 @@ jobs:
       contents: read
       pull-requests: read
     runs-on: ubuntu-24.04
-    # Only check commits on pull requests.
-    if: github.event_name == 'pull_request'
     steps:
       - name: get pr commits
+        if: github.event_name == 'pull_request' # Only check commits on pull requests.
         id: 'get-pr-commits'
         uses: tim-actions/[email protected]
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: check subject line length
+        if: github.event_name == 'pull_request' # Only check commits on pull requests.
         uses: tim-actions/[email protected]
         with:
           commits: ${{ steps.get-pr-commits.outputs.commits }}
           pattern: '^.{0,72}(\n.*)*$'
           error: 'Subject too long (max 72)'
 
+      - name: succeed (not a PR) # Allow all-done to succeed for non-PRs.
+        if: github.event_name != 'pull_request'
+        run: echo "Nothing to check here."
+
   cfmt:
     runs-on: ubuntu-24.04
     steps: