Try to publish gem (#5)

.github/workflows/gem-push.yml

@@ -0,0 +1,29 @@
+name: Build and Push Ruby Gem
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    name: Build + Push
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: actions/setup-ruby@v1
+      with:
+        ruby-version: 2.6.3
+
+    - 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" > $HOME/.gem/credentials
+        gem build *.gemspec
+        gem push --KEY github --host https://rubygems.pkg.github.com/${OWNER} *.gem
+      env:
+        GEM_HOST_API_KEY: "Bearer ${{secrets.GITHUB_TOKEN}}"
+        OWNER: ${{ github.repository_owner }}

.github/workflows/generate.yml

@@ -18,7 +18,7 @@ jobs:
 
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.6
+          ruby-version: 2.6.3
 
       - name: Install dependencies
         run: gem install grpc-tools

README.md

@@ -18,7 +18,7 @@ The official GRPC Ruby client for [Flipt](https://github.com/markphelps/flipt).
 
 ```ruby
 source "https://rubygems.pkg.github.com/markphelps" do
-  gem "flipt-grpc", "0.2.0"
+  gem "flipt-grpc", "0.3.0"
 end
 ```
 
@@ -28,7 +28,7 @@ end
 
 Or install it yourself as:
 
-    $ gem install flipt-grpc --version "0.2.0" --source "https://rubygems.pkg.github.com/markphelps"
+    $ gem install flipt-grpc --version "0.3.0" --source "https://rubygems.pkg.github.com/markphelps"
 
 ## Usage Example