Replace block-fixup job with gitlint

Signed-off-by: Matthias Beyer <[email protected]>

Author: matthiasbeyer

.github/workflows/fixupmerge.yml

@@ -0,0 +1,16 @@
+on: [pull_request]
+
+name: Git Checks
+
+jobs:
+  commit-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+      - run: pip install gitlint
+      - run: gitlint --commits $(git merge-base origin/master HEAD)..HEAD