Don't test Changes in master branch when running GitHub Actions

Author: oalders

.github/workflows/build-and-test.yml

@@ -27,6 +27,9 @@ jobs:
         run: dzil stale | xargs cpm install -g --show-build-log-on-failure
       - name: Build
         run: dzil build --no-tgz --in dzil_build_dir
+      - name: Maybe skip Changes test
+        if: github.ref == 'refs/heads/master'
+        run: rm dzil_build_dir/xt/release/changes_has_content.t
       - uses: actions/upload-artifact@master
         with:
           name: build_dir