Simplify condition

Use `ref_name` instead of formatting to compare to the `ref`.

Author: martincostello

.github/workflows/build.yml

@@ -131,7 +131,7 @@ jobs:
     runs-on: ubuntu-latest
     if: |
       github.event.repository.fork == false &&
-      (github.ref == format('refs/heads/{0}', github.event.repository.default_branch) ||
+      (github.ref_name == github.event.repository.default_branch ||
        startsWith(github.ref, 'refs/tags/'))
     steps: