feat: enforce lowercase start for PR title subjects

Author: HotThoughts

.github/workflows/lint-pr-title.yml

@@ -16,3 +16,8 @@ jobs:
         uses: amannn/action-semantic-pull-request@v5
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          # Enforce that the subject starts with a lowercase letter.
+          subjectPattern: ^[a-z].*$
+          subjectPatternError: |
+            The subject "{subject}" must start with a lowercase letter.