.github/workflows/publish.yml in fluent-plugin-formatter-protobuf-0.0.4 vs .github/workflows/publish.yml in fluent-plugin-formatter-protobuf-0.0.5

@@ -13,11 +13,11 @@
       packages: write
       contents: read
 
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Ruby 2.7
+      - name: Set up Ruby 2.5
         uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
       - name: "Unit test"
         run: "bundle exec rake lint:check"
@@ -29,30 +29,30 @@
       packages: write
       contents: read
 
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Ruby 2.7
+      - name: Set up Ruby 2.5
         uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
       - name: "Unit test"
         run: "bundle exec rake test:unit"
 
   publish-to-gpr:
     needs:
       - lint
       - test
-    name: Build + Publish
+    name: Build + Publish to GPR
     runs-on: ubuntu-latest
     permissions:
       packages: write
       contents: read
 
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Ruby 2.7
+      - name: Set up Ruby 2.5
         uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
 
       - name: Publish to GPR
@@ -65,33 +65,22 @@
           gem push --KEY github --host https://rubygems.pkg.github.com/${OWNER} *.gem
         env:
           GEM_HOST_API_KEY: "Bearer ${{secrets.GITHUB_TOKEN}}"
           OWNER: ${{ github.repository_owner }}
 
-      - name: Publish to RubyGems
-        run: |
-          mkdir -p $HOME/.gem
-          touch $HOME/.gem/credentials
-          chmod 0600 $HOME/.gem/credentials
-          printf -- "---\n:rubygems_api_key: ${GEM_HOST_API_KEY}\n" > $HOME/.gem/credentials
-          gem build *.gemspec
-          gem push *.gem
-        env:
-          GEM_HOST_API_KEY: "${{secrets.RUBYGEMS_AUTH_TOKEN}}"
-
   publish-to-ruby-gems:
     needs:
       - lint
       - test
-    name: Build + Publish
+    name: Build + Publish to RubyGems
     runs-on: ubuntu-latest
     permissions:
       packages: write
       contents: read
 
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Ruby 2.7
+      - name: Set up Ruby 2.5
         uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
 
       - name: Publish to RubyGems