Fix container permissions: run as root for GitHub Actions compatibility

Author: Mark Saroufim

.github/workflows/amd_workflow.yml

@@ -27,7 +27,7 @@ jobs:
     runs-on: ${{ github.event.inputs.runner }}
     container:
       image: ghcr.io/gpu-mode/amd-runner:main
-      options: --device=/dev/kfd --device=/dev/dri --group-add video --shm-size 64G
+      options: --user root --device=/dev/kfd --device=/dev/dri --group-add video --shm-size 64G
     strategy:
       fail-fast: false
     timeout-minutes: 20