Dockerfile typo

[DavidLarsKetch]

Behavior JS files are not being generated correctly; Dockerfile should be:

- RUN yarn install && ./bin/cli build -c ./behavior-config.yml -b
+ RUN yarn install && ./bin/cli behaviors -c ./behavior-config.yml -b

docker exec -it $MY_CONTAINER_ID ls dist/ confirms no files in the expected dir.

Happy to open a PR, but didn't see any contribution guidelines.

Full log from docker run -p 3030:3030 webrecorder/behaviors:

Starting behavior api server with configuration
{
  host: '0.0.0.0',
  port: 3030,
  numLookupWorkers: 2,
  behaviorInfo: {
    behaviorDir: '/app/dist',
    mdataPath: '/app/dist/behaviorMetadata.js',
    build: false
  },
  fastifyOpts: {
    trustProxy: true,
    maxParamLength: 5000000000000,
    logger: true,
    querystringParser: [Function: querystringParser]
  }
}

{"level":30,"time":1592863446875,"pid":1,"hostname":"a265fcac95ce","msg":"Server listening at http://0.0.0.0:3030","v":1}
Behavior api server listening on
http://0.0.0.0:3030
└── /
    ├── behavior (GET)
    └── info (GET)
        └── -
            ├── list (GET)
            └── all (GET)

Lookup Worker starting with configuration
{
  workerId: 0,
  behaviorInfo: {
    behaviorDir: '/app/dist',
    mdataPath: '/app/dist/behaviorMetadata.js',
    build: false
  }
}

Lookup worker 0 encountered an error Error: Cannot find module '/app/dist/behaviorMetadata.js'
Require stack:
- /app/api/lookupWorker.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:713:15)
    at Function.Module._load (internal/modules/cjs/loader.js:618:27)
    at Module.require (internal/modules/cjs/loader.js:771:19)
    at require (internal/modules/cjs/helpers.js:68:18)
    at loadBehaviorMdata (/app/api/lookupWorker.js:78:22)
    at MessagePort.<anonymous> (/app/api/lookupWorker.js:229:3)
    at Object.onceWrapper (events.js:291:20)
    at MessagePort.emit (events.js:203:13)
    at MessagePort.onmessage (internal/worker/io.js:70:8) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/app/api/lookupWorker.js' ]
}
Lookup worker 0 exited with code 1
Lookup Worker starting with configuration
{
  workerId: 1,
  behaviorInfo: {
    behaviorDir: '/app/dist',
    mdataPath: '/app/dist/behaviorMetadata.js',
    build: false
  }
}

Lookup worker 1 encountered an error Error: Cannot find module '/app/dist/behaviorMetadata.js'
Require stack:
- /app/api/lookupWorker.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:713:15)
    at Function.Module._load (internal/modules/cjs/loader.js:618:27)
    at Module.require (internal/modules/cjs/loader.js:771:19)
    at require (internal/modules/cjs/helpers.js:68:18)
    at loadBehaviorMdata (/app/api/lookupWorker.js:78:22)
    at MessagePort.<anonymous> (/app/api/lookupWorker.js:229:3)
    at Object.onceWrapper (events.js:291:20)
    at MessagePort.emit (events.js:203:13)
    at MessagePort.onmessage (internal/worker/io.js:70:8) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/app/api/lookupWorker.js' ]
}
Lookup worker 1 exited with code 1