ci: fail when autosquash commits exist

Author: bhcleek

Diff for: .github/workflows/git.yml

@@ -0,0 +1,11 @@
+name: git checks
+on: [pull_request]
+
+jobs:
+  autosquash-commits-integrated:
+    runs-on: ubuntu-18.04
+
+    steps:
+    - uses: actions/[email protected]
+    - name: Block Fixup Commit Merge
+      uses: 13rac1/[email protected]