fix(docker): robust jar glob, lavalink healthcheck + startup order, restrict 2333 to loopback

- COPY build/libs/*.jar instead of hardcoded discord-bot-1.0.0.jar (breaks on version bump)
- lavalink: add /v4/info healthcheck; bot waits for service_healthy before start;
  lavalink now depends on spotify-tokener
- lavalink host port bound to 127.0.0.1 (bot talks over docker network; no internet exposure)
- .dockerignore: exclude .github + lavalink/ from build context

docker-compose.yml

@@ -3,8 +3,10 @@ services:
     image: ghcr.io/lavalink-devs/lavalink:4-alpine
     container_name: loki-lavalink
     restart: unless-stopped
+    depends_on:
+      - spotify-tokener
     ports:
-      - "2333:2333"
+      - "127.0.0.1:2333:2333"
     volumes:
       - ./lavalink/application.yml:/opt/Lavalink/application.yml:ro
       - ./lavalink/plugins/:/opt/Lavalink/plugins/
@@ -13,6 +15,12 @@ services:
       JAVA_OPTS: "-Xmx1G -Xms256M"
       SPOTIFY_CLIENT_ID: ${SPOTIFY_CLIENT_ID}
       SPOTIFY_CLIENT_SECRET: ${SPOTIFY_CLIENT_SECRET}
+    healthcheck:
+      test: ["CMD-SHELL", "wget -q -O /dev/null --header=Authorization:Hch4HiVCxkKs9JPiSnrt4Q http://localhost:2333/v4/info || exit 1"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 20s
 
   spotify-tokener:
     image: ghcr.io/topi314/spotify-tokener:master
@@ -29,7 +37,8 @@ services:
     container_name: loki-bot
     restart: unless-stopped
     depends_on:
-      - lavalink
+      lavalink:
+        condition: service_healthy
     mem_limit: 1g
     ports:
       - "8712:8712"