debug: enable run-built-image to investigate cross-compilation issues

Temporarily enable run-built-image in CI to see what specific
cross-compilation tools are missing in the ubuntu environment.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
     - run: make build
     - run: make test
     - run: make test-e2e
-    #- run: make run-built-image
+    - run: make run-built-image
 
   fmt:
     name: Rustfmt