CI: Add build step

Author: bastelfreak

.github/workflows/pr.yml

@@ -66,6 +66,18 @@ jobs:
         with:
           repository: 'OpenVoxProject/openvox-server'
           submodules: true
+      - name: Setup ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.2'
+          bundler-cache: true
+      - name: Display Ruby environment
+        run: bundle env
+      - name: build
+        run: bundle exec rake vox:build
+        env:
+          EZBAKE_REPO: "https://github.com/${{ github.repository }}"
+          EZBAKE_BRANCH: $GITHUB_REF_NAME # https://docs.github.com/en/actions/reference/workflows-and-actions/variables
 
   tests:
     if: always()