Move checks from steps to job

.github/workflows/build.yml

@@ -137,6 +137,7 @@ jobs:
       - build_wheels
       - build_sdist_python_wheel
     runs-on: ubuntu-latest
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
     environment:
       name: TestPyPI
       url: https://test.pypi.org/project/mypy-dev/
@@ -150,7 +151,6 @@ jobs:
           path: dist
           merge-multiple: true
       - name: Release
-        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
         uses: actions/github-script@v7
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
@@ -188,7 +188,6 @@ jobs:
               });
             }
       - name: Upload to TestPyPI
-        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
         env:
           TWINE_REPOSITORY: testpypi
           TWINE_USERNAME: __token__