Add dockerhub push CI

.drone.yml

@@ -1,7 +1,7 @@
 ---
 kind: pipeline
 type: docker
-name: schwarzesbrett
+name: frontend
 
 steps:
   - name: build
@@ -16,3 +16,28 @@ volumes:
   - name: dockersock
     host:
       path: /var/run/docker.sock
+
+---
+kind: pipeline
+type: docker
+name: push-to-hub
+
+steps:
+  - name: docker
+    image: plugins/docker
+    settings:
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+      repo: grimmigerfuchs/schwarzesbrett
+      tags: latest
+
+depends_on:
+  - frontend
+
+trigger:
+  branch:
+    - main
+  event:
+    - push