Docker healthcheck for workers with no http listener

[JuniorJPDJ]

appservice, fed sender and pusher doesn't listen on any ports on which I could do healthchecks for docker :<

[clokep]

Seems reasonable to have a healthcheck endpoint for each worker. Probably could do it via a health resource type in the config.

[ShadowJonathan]

This issue is also triggered when the http listener port is non-"default"

See #11472 for a potential fix for this

[dklimpel]

An idea for a workaround.

Did you try enable a metrics endpoint? The metrics entdpoint also have an health-listener.