add Dockerfile and docker-compose for multi-stage build; update .gitignore and various HTML examples

docker-compose.yml

@@ -0,0 +1,20 @@
+services:
+  app-prod:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      target: prod
+    image: dbr-app:latest
+    ports:
+      - "8080:8080"
+    restart: unless-stopped
+    environment:
+      - POCKETBASE_HTTP_ADDR=0.0.0.0:8080
+    volumes:
+      - ./pb_public:/app/pb_public:ro
+      - ./pb_data:/app/pb_data
+    command: ["/app/server", "serve", "--http=0.0.0.0:8080"]
+
+volumes:
+  pb_public: {}
+  pb_data: {}