feat: Add Drone CI pipeline for automated image builds

- Add .drone.yml to build and push to local registry
- Update docker-compose.prod.yml to use registry image

.drone.yml

@@ -0,0 +1,13 @@
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: build minio-webui
+    image: plugins/docker
+    settings:
+      repo: registry.local.nothaft.cloud/minio-webui
+      tags: latest
+      dockerfile: Dockerfile
+      context: .
+      registry: registry.local.nothaft.cloud

docker-compose.prod.yml

@@ -15,10 +15,7 @@ services:
 
   # Combined app (backend + frontend)
   app:
-    image: minio-webui:latest
-    build:
-      context: .
-      dockerfile: Dockerfile
+    image: registry.local.nothaft.cloud/minio-webui:latest
     environment:
       - NODE_ENV=production
       - PORT=3000