Attempt to fix matrix gh-cache push

Author: lindseywild

.github/actions/gh-cache/save/action.yml

@@ -94,12 +94,17 @@ runs:
           git config user.email "github-actions[bot]@users.noreply.github.com"
           git commit -m "$(printf 'Save artifact: %s' "${{ inputs.path }}")" \
             && echo "Committed '${{ inputs.path }}' to 'gh-cache' branch" \
-            || echo "No changes to commit"
-          if git ls-remote --exit-code --heads origin gh-cache >/dev/null; then
+            || { echo "No changes to commit"; exit 0; }
+          # Push with retry to handle concurrent updates to gh-cache
+          for attempt in 1 2 3; do
+            if git push origin gh-cache 2>/dev/null; then
+              echo "Pushed to 'gh-cache' branch"
+              break
+            fi
+            echo "Push failed (attempt $attempt), rebasing and retrying..."
             git fetch origin gh-cache
             git rebase origin/gh-cache
-          fi
-          git push origin gh-cache
+          done
         else
           echo "'${{ inputs.path }}' does not exist"
           echo "Skipping commit and push"