Test deb installation

Author: code-asher

.github/workflows/ci.yaml

@@ -303,6 +303,9 @@ jobs:
       - name: Build packages with nfpm
         run: yarn package ${NPM_CONFIG_ARCH}
 
+      - name: Sanity test package
+        run: sudo dpkg -i ./release-packages/code-server_*.deb
+
       - name: Upload release artifacts
         uses: actions/upload-artifact@v2
         with: