ci: remove drone

.drone.yml

@@ -1,54 +0,0 @@
----
-kind: pipeline
-type: docker
-name: linting
-
-steps:
-  - name: gitleaks
-    image: plugins/gitleaks
-    settings:
-      path: .
-    when:
-      event:
-        exclude:
-          - tag
-
-  - name: hadolint
-    image: hadolint/hadolint:latest-debian
-    commands:
-      - hadolint Dockerfile
-
----
-kind: pipeline
-type: docker
-name: selfhosted
-depends_on: # bezieht sich auf linting pipeline
-  - linting
-steps:
-  - name: docker_build_and_push_selfhosted
-    image: plugins/docker
-    settings:
-      dockerfile: Dockerfile
-      repo: registry.mgrote.net/postfix
-      registry: registry.mgrote.net
-      tags:
-        - ${DRONE_COMMIT_SHA:0:8}
-        - ${DRONE_COMMIT_BRANCH}
-        - latest
-    when:
-      event:
-        exclude:
-          - pull_request
-          - tag
-
-  - name: docker_build_and_push_selfhosted_tag
-    image: plugins/docker
-    settings:
-      dockerfile: Dockerfile
-      repo: registry.mgrote.net/postfix
-      registry: registry.mgrote.net
-      tags:
-        - ${DRONE_TAG}
-    when:
-      event:
-        - tag