chore: build docker image in ci

.drone.yml

@@ -19,27 +19,6 @@ steps:
       GOARCH: amd64
     commands:
       - go build -v -o dist/machinelock-manager-linux-amd64
-  - name: Building for Windows
-    image: golang
-    environment:
-      GOOS: windows
-      GOARCH: amd64
-    commands:
-      - go build -v -o dist/machinelock-manager-windows-amd64
-  - name: Building for Mac
-    image: golang
-    environment:
-      GOOS: darwin
-      GOARCH: amd64
-    commands:
-      - go build -v -o dist/machinelock-manager-darwin-amd64
-  - name: Building for Mac Silicon
-    image: golang
-    environment:
-      GOOS: darwin
-      GOARCH: arm64
-    commands:
-      - go build -v -o dist/machinelock-manager-darwin-arm64
   - name: gitea release
     image: plugins/gitea-release
     settings:
@@ -51,4 +30,12 @@ steps:
         - md5
         - sha1
         - sha256
+  - name: build docker image
+    image: plugins/docker
+    settings:
+      username: ctdo
+      password:
+        from_secret: dockerhub_password
+      repo: ctdo/machinelock-manager
+      tags: latest