drone: disable e2e test

drone env is somehow broken. Before moving CI to GitHub Actions, disable the e2e temporarily.

Signed-off-by: Derek Su <derek.su@suse.com>

.drone.yml

@@ -11,7 +11,7 @@ steps:
   image: rancher/dapper:v0.4.2
   commands:
   - dapper ci
-  - dapper e2e-test
+  #- dapper e2e-test
   volumes:
   - name: docker
     path: /var/run/docker.sock