feat: remove drone pipeline

.drone.yml

@@ -1,41 +0,0 @@
----
-kind: pipeline
-type: docker
-name: default
-trigger:
-  event:
-    - tag
-
-steps:
-  - name: go get
-    image: golang
-    commands:
-      - go get
-      - mkdir dist
-  - name: Building for Linux
-    image: golang
-    environment:
-      GOOS: linux
-      GOARCH: amd64
-    commands:
-      - go build -v -o dist/machinelock-manager-linux-amd64
-  - name: gitea release
-    image: plugins/gitea-release
-    settings:
-      api_key: 
-        from_secret: token
-      base_url: https://git.ctdo.de
-      files: dist/*
-      checksum:
-        - md5
-        - sha1
-        - sha256
-  - name: build docker image
-    image: plugins/docker
-    settings:
-      username: ctdo
-      password:
-        from_secret: dockerhub_password
-      repo: ctdo/machinelock-manager
-      tags: latest
-