ci: 👷 add pipeline to publish docker image

.drone.yml

@@ -0,0 +1,19 @@
+kind: pipeline
+type: docker
+name: publish Docker image
+
+steps:
+  - name: publish
+    image: plugins/docker
+    settings:
+      repo: gitea.dikurium.ch/InnoPeak/drone-gitea-release
+      auto_tag: true
+      dockerfile: docker/Dockerfile
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+
+trigger:
+  branch: [main]
+  event: [push]