Problem

The "Create PR" step in .github/workflows/sync-release.yml fails with:

Created PR: could not add label: 'bazel-sync' not found

even though the bazel-sync label exists in the repository. The root cause is that gh pr create --label does not support comma-separated labels. When the workflow passes --label "bazel-sync,bazel-sync-clean", the CLI interprets the entire string "bazel-sync,bazel-sync-clean" as a single label name, which doesn't exist.

Fix

In the file .github/workflows/sync-release.yml, in the "Create PR" step (around lines 156-191):

1. Change the case block to set a label_flags variable with separate --label flags instead of a comma-separated labels string.
2. Update the gh pr create call to use $label_flags (unquoted, so word-splitting produces separate arguments) instead of --label "$labels".

Before (lines 156-186):

          case "$classification" in
            clean)
              title="✅ Sync ${commit_short}: ${commit_subject}"
              labels="bazel-sync,bazel-sync-clean"
              ;;
            build-changes)
              title="⚠️ Sync ${commit_short}: ${commit_subject}"
              labels="bazel-sync,bazel-sync-needs-attention"
              ;;
            conflict)
              title="❌ Sync ${commit_short}: ${commit_subject}"
              labels="bazel-sync,bazel-sync-conflict"
              ;;
            *)
              title="Sync ${commit_short}: ${commit_subject}"
              labels="bazel-sync"
              ;;
          esac

          ...

          pr_url=$(gh pr create \
            --base bazel \
            --head "${{ steps.create-branch.outputs.branch }}" \
            --title "$title" \
            --body-file "$report_file" \
            --label "$labels" 2>&1 || true)

After:

          case "$classification" in
            clean)
              title="✅ Sync ${commit_short}: ${commit_subject}"
              label_flags="--label bazel-sync --label bazel-sync-clean"
              ;;
            build-changes)
              title="⚠️ Sync ${commit_short}: ${commit_subject}"
              label_flags="--label bazel-sync --label bazel-sync-needs-attention"
              ;;
            conflict)
              title="❌ Sync ${commit_short}: ${commit_subject}"
              label_flags="--label bazel-sync --label bazel-sync-conflict"
              ;;
            *)
              title="Sync ${commit_short}: ${commit_subject}"
              label_flags="--label bazel-sync"
              ;;
          esac

          ...

          pr_url=$(gh pr create \
            --base bazel \
            --head "${{ steps.create-branch.outputs.branch }}" \
            --title "$title" \
            --body-file "$report_file" \
            $label_flags 2>&1 || true)

Key points:

• $label_flags must NOT be quoted in the gh pr create call so that bash word-splits it into separate arguments.
• Only the case block variable assignment and the gh pr create line need to change. Everything else in the file stays the same.

The following is the prior conversation context from the user's chat exploration (may be truncated):

User: This gh action is failing even though i have a bazel-sync label in the repo: classification="clean"
report_file="/tmp/sync-report.md"
commit_subject="[release/10.0] Source code updates from dotnet/dotnet (dotnet#124136)"
commit_short="066be76ee5d"
remaining="18"

case "$classification" in
clean)
title="✅ Sync ${commit_short}: ${commit_subject}"
labels="bazel-sync,bazel-sync-clean"
;;
build-changes)
title="⚠️ Sync ${commit_short}: ${commit_subject}"
labels="bazel-sync,bazel-sync-needs-attention"
;;
conflict)
title="❌ Sync ${commit_short}: ${commit_subject}"
labels="bazel-sync,bazel-sync-conflict"
;;
*)
title="Sync ${commit_short}: ${commit_subject}"
labels="bazel-sync"
;;
esac

Prepend commit info to the report

commit_header="Upstream commit: `${commit_short}` — ${commit_subject}"
commit_header+="\nRemaining after this: $((remaining - 1)) commit(s)\n\n---\n\n"
full_body=$(printf '%s' "$commit_header" && cat "$report_file")
echo "$full_body" > "$report_file"

pr_url=$(gh pr create
--base bazel
--head "sync/release-10.0-066be76ee5d"
--title "$title"
--body-file "$report_file"
--label "$labels" 2>&1 || true)

Extract PR number from URL

pr_number=$(echo "$pr_url" | grep -oP '/pull/\K[0-9]+' || echo "")
echo "pr_number=$pr_number" >> "$GITHUB_OUTPUT"
echo "Created PR: $pr_url"
shell: /usr/bin/bash -e {0}
env:
GH_TOKEN: ***
Created PR: could not add label: 'bazel-sync' not found

Assistant: The issue is clear: the gh pr create --label "$labels" command is failing because the labels (bazel-sync, `bazel-sync-...