Use language package managers instead of os package manager for the dockerfile.

[seivan]

Read a list of (lang, version) from either local ./runme.yaml or from $RUNME_CONFIG ( global on host).
Then feed those to the language package managers like rustup, or nvm, ruby-env or alternatives. There's also mise which would let you just iterate over (lang, version) and feed it into a file on the container and let it manage the rest:

[tools]
node = '22' 
python = '3'
ruby = 'latest'

That being said I recommend devbox
because apart from languages, it would also allow for any binary that you could run locally and it works on CI out of the box .

 "packages": [
        "ripgrep@latest",
        "[email protected]"
    ]

instead of this

The benefit of using individual language manager is that it's easier to switch them out.

[sourishkrout]

@seivan could you be more specific what you mean with "for the dockerfile" please? I'm a bit lost.