ci(github): add commit lint action to PRs

This is supposed to check every single commit in a PR
for having the correct message format.

Previously the semantic PR action was only checking
the PR title or the first commit message, so you could
get in invalid commit messages by adding multiple
commits post-approval which the semantic PR action
would not check properly.

Signed-off-by: Peter Somogyvari <peter.somogyvari@accenture.com>

.github/workflows/commitlint-pull-request.yml

@@ -0,0 +1,11 @@
+name: "Commit Lint"
+on: [pull_request]
+
+jobs:
+  commitlint:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2.3.4
+        with:
+          fetch-depth: 0
+      - uses: wagoid/commitlint-github-action@v3.1.4