Use bazel build for BCR release test command

By default, the release_ruleset wants to use `bazel test //...`, but
this will fail since we have no tests registered with bazel (we use
jasmine via gulp). Instead, just try to build the tarball as a basic
check.

Author: dibenede

.github/workflows/release.yaml

@@ -22,6 +22,7 @@ jobs:
     release:
         uses: bazel-contrib/.github/.github/workflows/[email protected]
         with:
+            bazel_test_command: "bazel build //:dist_tar"
             prerelease: false
             release_files: protobuf-javascript-*.tar.gz
             tag_name: ${{ inputs.tag_name || github.ref_name }}