build(docker): Add Docker Compose and Lavalink Configuration

application.yml

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+# application.yml (Example)
+server: # REST and WS server
+  port: 2333
+  address: 0.0.0.0 # Listen on all interfaces within the container
+lavalink:
+  server:
+    password: "youshallnotpass" # CHANGE THIS to a strong password
+    sources:
+      youtube: true
+      bandcamp: true
+      soundcloud: true
+      twitch: true
+      vimeo: true
+      http: true
+      local: false
+    # bufferDurationMs: 400 # How many milliseconds of audio to buffer? Lower values are less safe.
+    # youtubePlaylistLoadLimit: 6 # Number of pages at 100 tracks each
+    # playerUpdateInterval: 5 # How frequently to send player updates to clients, in seconds
+    # youtubeSearchEnabled: true
+    # soundcloudSearchEnabled: true
+    # bandcampSearchEnabled: true # Not implemented by LavaLink currently
+    # Default values are generally fine
+    # You can find more options here: https://github.com/lavalink-devs/Lavalink/blob/master/IMPLEMENTATION.md#configuration
+logging:
+  file:
+    max-history: 30
+    max-size: 1GB
+  path: ./logs/
+
+  level:
+    root: INFO
+    lavalink: INFO