Meta: Add a check for periods on the end of titles to commit linter

.github/workflows/cmake.yml

@@ -265,6 +265,14 @@ jobs:
         pattern: '^\S.*?: .+'
         error: 'Missing category in commit title (if this is a fix up of a previous commit, it should be squashed)'
 
+    - name: Check title
+      if: ${{ success() || failure() }}
+      uses: tim-actions/commit-message-checker-with-regex@v0.3.1
+      with:
+        commits: ${{ steps.get-pr-commits.outputs.commits }}
+        pattern: '^.+[^.\n](\n.*)*$'
+        error: 'Commit title ends in a period'
+
   notify_irc:
     needs: [build_and_test_serenity, build_and_test_lagom, lint_commits]
     runs-on: ubuntu-20.04