Force clean LiveKit Docker build without cache

- Add --no-cache flag to prevent cached build failures
- Ensure binary download happens fresh every time

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

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

Author: YedPool

.github/workflows/test-docker.yml

@@ -136,7 +136,7 @@ jobs:
     - name: Build LiveKit Docker image
       run: |
         cd livekit-server
-        docker build --progress=plain -t livekit-server:test .
+        docker build --progress=plain --no-cache -t livekit-server:test .
         
     - name: Test LiveKit container startup
       run: |