CI: Install tzdata for musl-based Ruby docker images

[tisba]

I saw @bnoordhuis's change in #352.

I think instead of swallowing the error because it breaks in CI, we should fix the CI setup. I suspect that the TZInfo zoneinfo data is simply missing in the Ruby alpine docker image.

I tested this with docker and ruby:3.4-alpine. When I install the required tzdata (via apk add --no-cache tzdata) it works as expected:

irb(main):001> require "active_support"
=> true
irb(main):002> require "active_support/time"
=> true
irb(main):003> Time.zone = "UTC"
=> "UTC"

Without the tzdatapackage, it breaks like described in #351.

[bnoordhuis]

I think instead of swallowing the error because it breaks in CI, we should fix the CI setup.

That's not the sole reason. It's also for people running tests locally.

Speaking from experience with node and libuv: test suites shouldn't come with too many constraints if you want people to actually run them.

[tisba]

oh sorry, that's actually not what I meant to say 🤦 I do think we should keep the change. Meant to say that we should setup CI in a way that the test is not skipped.

That's why I also changed the mini test output in CI, so we actually see tests that have been skipped.