Add action to audit publicly listed organizations

[IanButterworth]

It seems to be reasonable to expect any publicly listed julia organization to have at least 2 public members.

This sets up an action to check that whenever the list is changed in community/organizations.md, or if the action is manually triggered, otherwise it won't run to avoid noise on unrelated PRs.

TODO:

• Currently dependent on an unreleased version of GitHub.jl add way to get org members JuliaWeb/GitHub.jl#218
• Revert the community/organizations.md change before merge

[github-actions]

Once the build has completed, you can preview your PR at this URL: https://julialang.netlify.app/previews/PR1941/ in ~15 minutes

[StefanKarpinski]

Very good idea!

[IanButterworth]

@StefanKarpinski do you think community/organizations.md should also have some sort of notice like:

Organizations listed here should strive to have at least 2 owners with admin rights, and at least 2 public members. Doing so helps to protect the organization's repositories against a single person being unreachable.

[DilumAluthge]

at least 2 members with admin rights

It might be clearer to change "members with admin rights" to "organization owners".

[ViralBShah]

Looks great. Let's get it merged.

[IanButterworth]

Ok. What do you think about #1941 (comment)

[ViralBShah]

Ok. What do you think about #1941 (comment)

That feels totally reasonable. Let's do it.

[IanButterworth]

I'll go ahead with this. At this point, this is the status

Finding orgs with fewer than 2 public memers that are listed in https://julialang.org/community/organizations/
 - JuliaPraxis 1 members
 - JuliaActors 0 members
 - JuliaFirstOrder 1 members
 - JuliaNLSolvers 1 members
 - JuliaNonconvex 1 members
 - JuliaActuary 1 members
 - ModiaSim 1 members
 - JuliaAstrodynamics 1 members
 - juliahci 1 members
 - JuliaQuantum 1 members