Nightly build is failing on macos because it can't build Ruby

[straight-shoota]

https://app.circleci.com/pipelines/github/crystal-lang/crystal/6938/workflows/19a6d680-05e1-44af-8302-969bbe1efc05/jobs/64236

compiling vm.c
In file included from vm.c:344:
./vm_insnhelper.c:5045:43: error: use of undeclared identifier 'RUBY_FUNCTION_NAME_STRING'
        fprintf(stderr, "%s %s(%d):%p\n", RUBY_FUNCTION_NAME_STRING, bf->name, bf->argc, bf->func_ptr);
...
make: *** [vm.o] Error 1
!!! Compiling ruby 2.7.3 failed!

[straight-shoota]

Looks similar to this: rvm/rvm#5047 (comment)

[straight-shoota]

@bcardiff What's the reason that we're building Ruby ourselves with ruby-install vs. installing Ruby via homebrew, for example?

[straight-shoota]

While investigating this, a different error showed up with openssl. Ruby does not yet work with OpenSSL 3.0 but that's installed via homebrew. This issue is tracked in postmodern/ruby-install#409 and fixed in the latest release of ruby-install (0.8.3). So I suppose we just need to run brew update ruby-install until the update is propagated into the CI runner base system.

[straight-shoota]

With updated ruby-install, the build is green: https://app.circleci.com/pipelines/github/crystal-lang/crystal/6945/workflows/e83f3834-3222-4fcd-a901-b7bc92d6ec31/jobs/64326

[bcardiff]

I don't expect for the CI to trigger a build to do ruby-install . If that is happening, maybe a brew update is needed or we can change how to get that ruby version. I don't recall nothing more than using a specific ruby version to be as precise as possible when running omnibus. The latest update on omnibus required a bump in ruby version used.

[straight-shoota]

I suppose we could as well install Ruby from brew, pinned to ruby@2.7 and don't build it ourselves?

[beta-ziliani]

@bcardiff What breaks if we do brew install ruby (no version) and then install bundler from gem?

[bcardiff]

@beta-ziliani that things might break without us changing a thing in the CI due to external updates. It can still happen, but there are higher changes :-). I would rather use pinned ruby versions. This is the way 🤓

[straight-shoota]

+1 to pinned versions (#11282)

But brew install ruby@2.7 would serve that purpose as well.