Add settings for ignore gem push error on GitHub Actions

Author: koshilife

.github/workflows/gem-push.yml

@@ -32,5 +32,6 @@ jobs:
           printf -- "---\n:rubygems_api_key: ${GEM_HOST_API_KEY}\n" > $HOME/.gem/credentials
           gem build *.gemspec
           gem push *.gem
+        continue-on-error: true
         env:
           GEM_HOST_API_KEY: ${{secrets.RUBYGEMS_AUTH_TOKEN}}