feat: add frontend service + dockerfile + env example

docker-compose.yml

@@ -45,3 +45,26 @@ services:
       timeout: 5s
       retries: 3
       start_period: 30s
+
+  frontend:
+    build: ./frontend
+    image: denpa-radio-frontend:latest
+    restart: always
+    env_file: config/frontend.env
+    ports:
+      - '172.17.0.1:12001:3000'
+    volumes:
+      - type: bind
+        source: /mnt/trashbox/denpa-radio/library
+        target: /library
+        read_only: true
+      - type: bind
+        source: ./data/now-playing
+        target: /now-playing
+        read_only: true
+    healthcheck:
+      test: ['CMD', 'wget', '-q', '-O', '-', 'http://localhost:3000/api/stations.json']
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 15s