Add release build

Author: anaynayak

.github/workflows/rubygem_release.yml

@@ -0,0 +1,27 @@
+name: Ruby Gem Release
+
+on:
+  release:
+
+jobs:
+  build:
+    name: Build + Publish
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby 2.6
+        uses: actions/setup-ruby@v1
+        with:
+          ruby-version: 2.6.x
+
+      - 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}}"