Implement replica-set setup as --health-cmd in ci:build and ci:build:image

[make-github-pseudonymous-again]

Already implemented for ci:build:compose in #880.

See https://docs.docker.com/engine/reference/run/#healthchecks for documentation.

Not that there does not seem to be a way to set this up on startup via /docker-entrypoint-initdb.d/, see docker-library/mongo#339.

See also docker-library/mongo#246 (comment).

[make-github-pseudonymous-again]

Note that replica-set setup logic was initially derived from

https://github.com/zodern/meteor-up/blob/2272e108dc2c1b227398b175e81dc4b8772e1745/src/plugins/mongo/assets/templates/start.sh#L47.

[make-github-pseudonymous-again]

Might be impossible, due to

• Image from "scratch" has no shell, but passing the --health-cmd to docker run uses CMD-SHELL docker/cli#3719

Let's see.

[make-github-pseudonymous-again]

Note that we cannot use --health-start-interval today. See:

• dockerfile parse error unknown flag: start-interval docker/cli#4486
• Tracking issue for health start interval moby/moby#45897