Fix duplicate Docker socket mount in CI workflow

Runner already passes Docker socket to job containers —
explicit container.volumes caused duplicate mount error.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/deploy.yaml

@@ -11,9 +11,6 @@ env:
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest
-    container:
-      volumes:
-        - /var/run/docker.sock:/var/run/docker.sock
     steps:
       - name: Checkout
         uses: actions/checkout@v4