Upon installing their first Ruby version on the system, the user may want to set it as their default; otherwise the default will remain "system" and any `gem install` attempts will fail with a permission error.

This suggestion is skipped if the user already has chosen an explicit default, even if it's "system".

Allow OPENSSL_VERSION_TEXT string match without last line for OpenSUSE

macOS: Use GMP from homebrew

MRI's BigInt use GMP under the hood if available, and if not
fallbacks to an homemade implementation with much worse performance.

Without GMP:
```
>> Benchmark.realtime { Integer('1' * (10 ** 7)) }
=> 13.80743500002427
```

With GMP
```
>> Benchmark.realtime { Integer('1' * (10 ** 7)) }
=> 0.4098639999865554
```

macOS not being a common production platform, it's not a huge deal
but it would still preferable to compile with `gmp.h` if present.

I'd also suggest to print a warning if compiling on macOS and gmp
isn't installed, but I don't know if it's desirable.

NB: `--with-gmp-dir` was only added recently, so this will only
apply to MRI >= 3.2, as well as rubies on which this flag was backported.

ci(lint): add shell linter - Differential ShellCheck

It performs differential ShellCheck scans and report results directly in pull request.

documentation: https://github.com/redhat-plumbers-in-action/differential-shellcheck



Signed-off-by: Jan Macku <jamacku@redhat.com>

Signed-off-by: Varun Sharma <varunsh@stepsecurity.io>

bash didn't provide \d

Added 3.2.0-preview2

Fix required rustc version for YJIT in output

Relax rustc version to 1.58.1

suggested by @k0kubun

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

Enable YJIT only x86_64 and arm64

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

Re-enable YJIT with arm64

* Fixes https://github.com/rbenv/ruby-build/issues/1721

* `openssl version` can be another version than the header, for instance with
  `apt-get install --no-install-recommends ca-certificates libssl1.0-dev` on Ubuntu 18.04:
  https://github.com/rbenv/ruby-build/discussions/2014#discussioncomment-3224237