fix(ci): drop docker.sock workflow mount (runner auto-mounts it)

The Gitea act_runner already bind-mounts /var/run/docker.sock into job
containers when its own runner container has the socket mounted. The
workflow-level mount duplicated it and act_runner aborted the job with
'Duplicate mount point: /var/run/docker.sock'.

.gitea/workflows/deploy.yml

@@ -27,13 +27,12 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    # Gitea Actions: pin image so docker CLI is present and mount the
-    # host docker socket so build-push-action can push to the registry.
-    # The runner declares /var/run/docker.sock in valid_volumes.
+    # Gitea Actions: pin image so docker CLI is present. The runner
+    # already bind-mounts /var/run/docker.sock into job containers
+    # automatically (because it has the socket mounted itself); adding
+    # `volumes:` here again triggers a duplicate-mount-point error.
     container:
       image: catthehacker/ubuntu:runner-latest
-      volumes:
-        - /var/run/docker.sock:/var/run/docker.sock
     timeout-minutes: 15
     if: ${{ vars.DEPLOY_ENABLED == 'true' }}
     outputs: