[CHORE] Create workflow to auto publish a gem (#12)

* Create publish-gem.yml

* Update name

Co-authored-by: Zara Kay <[email protected]>

Co-authored-by: Zara Kay <[email protected]>

Author: bharat619

.github/workflows/publish-gem.yml

@@ -0,0 +1,30 @@
+name: Ruby Gem
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    name: Build + Publish
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: .ruby-version
+        bundler-cache: true
+
+    - name: Publish to GPR
+      run: |
+          mkdir -p $HOME/.gem
+          touch $HOME/.gem/credentials
+          chmod 0600 $HOME/.gem/credentials
+          printf -- "---\n:github: ${GEM_HOST_API_KEY}\n" > $HOME/.gem/credentials
+          gem build *.gemspec
+          gem push -V --key github --host https://rubygems.pkg.github.com/${OWNER} *.gem    
+      env:
+        GEM_HOST_API_KEY: "Bearer ${{secrets.GITHUB_TOKEN}}"
+        OWNER: ${{ github.repository_owner }}