ci: buildkit is required for this project

.drone.yml

@@ -18,6 +18,7 @@ steps:
     #     path: /stupid
     environment:
       DOCKER_REPO: glenux/service-nextcloud
+      DOCKER_BUILDKIT: 1
     settings:
       username:
         from_secret: DOCKERHUB_USERNAME
@@ -33,6 +34,8 @@ steps:
     # volumes:
     #   - name: cache
     #     path: /stupid
+    environment:
+      DOCKER_BUILDKIT: 1
     settings:
       username:
         from_secret: DOCKERHUB_USERNAME
@@ -50,6 +53,8 @@ steps:
 
   - name: publish:latest
     image: plugins/docker
+    environment:
+      DOCKER_BUILDKIT: 1
     settings:
       username:
         from_secret: DOCKERHUB_USERNAME