Fix homebrew-release workflow for retags and fork URLs

The URL/SHA update patterns only matched MFlowCode/MFC URLs, so the
workflow failed when the formula temporarily pointed at a fork (e.g.
during testing). Also, the commit step failed when the formula was
already up to date (retag scenario). Broaden the URL patterns and
skip the push gracefully when there are no changes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson

.github/workflows/homebrew-release.yml

@@ -109,13 +109,14 @@ jobs:
 
           echo "Updating formula to v${VERSION}..."
 
-          # Update URL
-          sed -i "s|url \"https://github.com/MFlowCode/MFC/archive/refs/tags/v[^\"]*\.tar\.gz\"|url \"https://github.com/MFlowCode/MFC/archive/refs/tags/v${VERSION}.tar.gz\"|" "$FORMULA"
+          # Update URL (match any GitHub archive URL, not just MFlowCode/MFC,
+          # in case the formula temporarily points at a fork during testing)
+          sed -i "s|url \"https://github.com/[^\"]*/archive/[^\"]*\.tar\.gz\"|url \"https://github.com/MFlowCode/MFC/archive/refs/tags/v${VERSION}.tar.gz\"|" "$FORMULA"
 
           # Update SHA256 (the one right after url, not bottle SHAs)
           # This uses awk to only update the first sha256 after the url line
           awk -v newsha="$SHA256" '
-            /^  url "https:\/\/github.com\/MFlowCode\/MFC/ { found_url=1 }
+            /^  url "https:\/\/github.com\// { found_url=1 }
             found_url && /^  sha256 "/ && !updated {
               sub(/sha256 "[^"]*"/, "sha256 \"" newsha "\"")
               updated=1
@@ -157,13 +158,16 @@ jobs:
           git config user.email "github-actions[bot]@users.noreply.github.com"
 
           git add Formula/mfc.rb
-          git commit -m "Update MFC to v${VERSION}"
 
-          echo "Pushing to homebrew-mfc..."
-          git push origin main
-
-          echo "Successfully pushed formula update!"
-          echo "The bottle.yml workflow in homebrew-mfc will now build bottles automatically."
+          if git diff --cached --quiet; then
+            echo "::notice::Formula already up to date for v${VERSION} — nothing to push."
+          else
+            git commit -m "Update MFC to v${VERSION}"
+            echo "Pushing to homebrew-mfc..."
+            git push origin main
+            echo "Successfully pushed formula update!"
+            echo "The bottle.yml workflow in homebrew-mfc will now build bottles automatically."
+          fi
 
       - name: Dry run summary
         if: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.dry_run == 'true' }}