ci: remove push to dockerhub

.drone.yml

@@ -57,44 +57,3 @@ steps:
     when:
       event:
         - tag
-
----
-kind: pipeline
-type: docker
-name: dockerhub
-depends_on: # bezieht sich auf linting pipeline
-  - linting
-steps:
-  - name: docker_build_and_push_dockerhub
-    image: plugins/docker
-    settings:
-      username:
-        from_secret: DOCKERHUB_USER
-      password:
-        from_secret: DOCKERHUB_PASS
-      dockerfile: Dockerfile
-      repo: quotengrote/miniflux-filter
-      tags:
-        - ${DRONE_COMMIT_SHA:0:8}
-        - ${DRONE_COMMIT_BRANCH}
-        - latest
-    when:
-      event:
-        exclude:
-          - pull_request
-          - tag
-
-  - name: docker_build_and_push_dockerhub_tag
-    image: plugins/docker
-    settings:
-      username:
-        from_secret: DOCKERHUB_USER
-      password:
-        from_secret: DOCKERHUB_PASS
-      dockerfile: Dockerfile
-      repo: quotengrote/miniflux-filter
-      tags:
-        - ${DRONE_TAG}
-    when:
-      event:
-        - tag