[~] Add release action

.github/workflows/release.yml

@@ -0,0 +1,45 @@
+name: Release gem
+
+on:
+  push:
+    paths:
+      - "lib/annotato/version.rb"
+    branches:
+      - main
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.4.1"
+          bundler-cache: true
+
+      - name: Install dependencies
+        run: |
+          bundle install --jobs 4 --retry 3
+
+      - name: Build gem
+        run: |
+          gem build *.gemspec
+          ls -la
+
+      - name: Publish to RubyGems
+        env:
+          RUBYGEMS_API_KEY: ${{ secrets.RUBYGEMS_API_KEY }}
+        run: |
+          GEM_FILE=$(ls *.gem)
+          mkdir -p ~/.gem
+          cat << EOF > ~/.gem/credentials
+          ---
+          :rubygems_api_key: ${RUBYGEMS_API_KEY}
+          EOF
+          chmod 0600 ~/.gem/credentials
+
+          gem push "$GEM_FILE"