fix: commitlint breaks on force push commits

Author: krsche

.github/workflows/commitlint.yaml

@@ -24,6 +24,16 @@ jobs:
 
       - if: github.event_name == 'push' && !startsWith(github.ref, 'refs/tags')
         name: commitlint (push)
-        run: commitlint --from ${{ github.event.before }}
         # use .before instead of HEAD~1 so that pushes with multiple commits are completely covered as well
-        # --from is not inclusive, so HEAD~1 will only analyze HEAD
+        # --from is not inclusive, so HEAD~1 will only analyze HEAD
+        # BUT:
+        # check if commit exists first (e.g. it doesn't if it was force pushed) 
+        # or fall back to HEAD~1
+        run: |
+          git cat-file -t ${{ github.event.before }} > /dev/null
+          if [[ $? -eq "0" ]]; then 
+            commitlint --from ${{ github.event.before }}
+          else
+            commitlint --from HEAD~1
+          fi
+