Add fixup check to gh actions (#774)

Signed-off-by: Marcus Brandenburger <bur@zurich.ibm.com>

Author: mbrandenburger

.github/workflows/git.yml

@@ -0,0 +1,20 @@
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+
+name: Git checks
+
+on: [pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  block-fixup:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Block Fixup Commit Merge
+        uses: 13rac1/block-fixup-merge-action@v2.0.0