fix: make CI idempotent and add test job

The publish step failed when pushing a version that already existed on
GitHub Packages. Now it gracefully skips if the version is already
published. Also split the workflow into separate test and publish jobs
so tests run on PRs without attempting to publish.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: architecture

.github/workflows/gem-push.yml

@@ -7,9 +7,26 @@ on:
     branches: [ "main" ]
 
 jobs:
-  build:
-    name: Build + Publish
+  test:
+    name: Test
     runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Ruby 3.3
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: '3.3'
+        bundler-cache: true
+
+    - name: Run tests
+      run: ruby -Ilib -Itest -e "Dir.glob('test/*_test.rb').each{|f| require File.expand_path(f)}"
+
+  publish:
+    name: Publish
+    needs: test
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     permissions:
       contents: read
       packages: write
@@ -29,8 +46,16 @@ jobs:
         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} elevenlabs-*.gem
+        output=$(gem push --KEY github --host https://rubygems.pkg.github.com/${OWNER} elevenlabs-*.gem 2>&1) || {
+          if echo "$output" | grep -q "already been pushed"; then
+            echo "Version already published — skipping."
+            exit 0
+          else
+            echo "$output"
+            exit 1
+          fi
+        }
+        echo "$output"
       env:
         GEM_HOST_API_KEY: "Bearer ${{secrets.GITHUB_TOKEN}}"
         OWNER: ${{ github.repository_owner }}
-