Update README to link to list of package managers.

[markdorison]

When I was working with the Docker image locally, it took me a minute to parse what the acceptable arguments were for the package manager. I added a link to the documentation, but I am not sure that is the best place, as I see gomod listed there for Go as opposed to go_modules used here. I see the list with names in some of the GitHub actions workflows.

Is there a better, more canonical place that I could link this documentation to with the appropriate values?

[jeffwidman]

Thanks Mark, and I feel your pain, I hit the same thing yesterday.

Unfortunately, the naming is a bit confusing here because it's actually the ruby module name in this context... ie, go_modules rather than gomod.

This is a horrid user experience, and probably one we should cleanup sooner rather than later.

If it's okay with you, let's float this PR for a bit as a reminder to me to look into what it'd take to start to standardize some of this to reduce confusion... I don't think saying "go_modules" one place and "gomod" is intuitive for anyone.

[markdorison]

@jeffwidman That makes sense to me. There is probably more elegant way to solve this in the long run, but in the meantime, should we turn this into a table for the README similar to what I did in #6577 (comment)?

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