Test swift-syntax using GitHub Actions during PR testing and during the publish release workflow

Author: ahoppen

.github/workflows/publish_release.yml

@@ -37,8 +37,10 @@ jobs:
         release: [true, false]
     with:
       # We require that releases of swift-syntax build without warnings
+      enable_macos_checks: true
       linux_build_command: swift test -Xswiftc -warnings-as-errors ${{ matrix.release && '-c release' || '' }}
       windows_build_command: swift test -Xswiftc -warnings-as-errors ${{ matrix.release && '-c release' || '' }}
+      macos_build_command: swift test -Xswiftc -warnings-as-errors ${{ matrix.release && '-c release' || '' }}
   create_tag:
     name: Create Tag
     runs-on: ubuntu-latest

.github/workflows/pull_request.yml

@@ -15,6 +15,8 @@ jobs:
     # As a workaround, we mark automerge PRs that are created by GitHub actions as draft and trigger the GitHub actions by marking the PR as ready for review. But we don't want to re-trigger testing this when a normal user's PR is marked as ready for review.
     if: (github.event.action != 'ready_for_review') || (github.event.action == 'ready_for_review' && github.event.pull_request.user.login == 'github-actions[bot]')
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
+    with:
+      enable_macos_checks: true
   soundness:
     name: Soundness
     if: (github.event.action != 'ready_for_review') || (github.event.action == 'ready_for_review' && github.event.pull_request.user.login == 'github-actions[bot]')