Filebeat 8.17.0 docker container not starting

[wargamez]

docker run docker.elastic.co/beats/filebeat:8.17.0
Error: unknown command "container" for "filebeat"
Run 'filebeat --help' for usage.

[botelastic]

This issue doesn't have a Team:<team> label.

[fonfalleh]

Dockerfile uses CMD ["-environment" "container"], seems to work if overriding using --environment instead.
This worked up until 8.16.1 as far as I can tell.

Docs say that -environment should have one dash, so that's another place which could use some review as well.
https://www.elastic.co/guide/en/beats/filebeat/8.17/command-line-options.html#global-flags

Saw interesting commit, is this related? 15eae5f

[cmacknz]

Same as #42038

See #42038 (comment) for a work around.