Remove duplicate Docker socket mount from workflow

Runner already mounts /var/run/docker.sock automatically.
Keep only --privileged flag to allow socket access.

Fixes: Error response from daemon: Duplicate mount point

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

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

.gitea/workflows/build-deploy.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     container:
       image: ghcr.io/catthehacker/ubuntu:full-22.04
-      options: --privileged -v /var/run/docker.sock:/var/run/docker.sock
+      options: --privileged
 
     steps:
       - name: Checkout code