Errors installing docker container

Node.js v22.13.1
❌ Invalid environment variables: [
  {
    code: 'invalid_type',
    expected: 'string',
    received: 'undefined',
    path: [ 'DB_URL' ],
    message: 'Required'
  }
]
/app/apps/websocket/wssServer.cjs:498552
    throw new Error("Invalid environment variables");
    ^

Error: Invalid environment variables
    at onValidationError (/app/apps/websocket/wssServer.cjs:498552:11)
    at createEnv (/app/apps/websocket/wssServer.cjs:498558:12)
    at createEnv2 (/app/apps/websocket/wssServer.cjs:498599:10)
    at Object.<anonymous> (/app/apps/websocket/wssServer.cjs:498651:11)
    at Module._compile (node:internal/modules/cjs/loader:1562:14)
    at Object..js (node:internal/modules/cjs/loader:1699:10)
    at Module.load (node:internal/modules/cjs/loader:1313:32)
    at Function._load (node:internal/modules/cjs/loader:1123:12)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:217:24)