[Ruby 3.0] Migrate google-api-client gem and drop Ruby 2.4

[ainame]

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.

Motivation and Context

As per plan #17931, I've been working on Ruby 3.0 support. Prior to this PR, I have done the followings -

• Updated CI environment/checks to prevent regressions
• Removed deprecation warnings
• Bumped Rubocop's version to the latest
• Replaced unmaintained gems with alternatives

This PR finally unblocks Ruby 3.0 installation by migrating google-api-client gem to new ones that support Ruby 3.0. I also enabled CI checks with Ruby 3.0 on CircleCI, which requires us to install it manually as they haven't released a new macOS image with Xcode 12.5 that is supposed to bundle it.

After this PR gets merged, we are going to be ready to release the new version that officially supports Ruby 3.0 and drop Ruby 2.4 support at the same time.

Description

https://github.com/googleapis/google-api-ruby-client/blob/master/google-api-client/OVERVIEW.md

google-api-client is now split by service. (Just like AWS did for aws-sdk-ruby v3!). We can install only what we use. For fastlane we only use google-apis-playcustomapp_v1 and google-apis-androidpublisher_v3. I put them in gemspec. google-cloud-storage is more like a higher abstracted library to interact with Cloud Storage. It depends on google-apis-iamcredentials_v1 and google-apis-storage_v1 internally.

As far as I read changelog files, there's no breaking change in those four services playcustomapp_v1, androidpublisher_v3, google-apis-iamcredentials_v1 and google-apis-storage_v1 (since google-api-client 0.37.0) and google-cloud-storage (sicne 1.15).

Links
https://github.com/googleapis/google-api-ruby-client/blob/master/google-api-client/CHANGELOG.md
https://github.com/googleapis/google-cloud-ruby/blob/master/google-cloud-storage/CHANGELOG.md#1310--2021-03-10

That change only broke a test case that stub API requests. The gem changed the hostname of API once apparently.

Testing Steps

Try supply. I personally have never used supply or Android related actions. I appreciate if people try to use this branch for testing 😂

[chris-araman]

Does this comment still apply?

[ainame]

Do you know that? 😂 I couldn't find the statement that those gems follow the semantic versioning.

[ainame]

But there's no reason to keep them as is. Will revise it.

[chris-araman]

I don't know whether the new gems are intended to use semantic versioning. I only noticed that these are no longer version locked.

[ainame]

That's right! Thanks.

[mikehardy]

Obviously these are different ecosystems, but if the versions line up at all, at least for javascript the google-apis follows semantic versioning, but it's essentially nothing but major versions because of it - there is always some API changing incompatibly: https://github.com/googleapis/google-api-nodejs-client/blob/master/CHANGELOG.md

[ainame]

I ended up removing the comment.

As far as I read this thread, they can publish any breaking changes within pre-1.0 version technically.
googleapis/google-api-ruby-client#833 (comment)

That said since they split the gem, it's easy to assume that there are fewer likely breaking changes than before. Their typical breaking changes were removals by APIs; for example, below changelog, which now are split into each gem. If the removal happens, it will appear as the gem's error, which we won't be able to prevent anyway unless we keep catching up with their changes.

Breaking changes:
Deleted androidpublisher_v1_1
Deleted androidpublisher_v2

https://github.com/googleapis/google-api-ruby-client/blob/master/google-api-client/CHANGELOG.md#0420

So my conclusion is to not strict about minor version updates and to keep eyes on their changes. There are new changelog files for each gem as well. We can check them when needed.

https://github.com/googleapis/google-api-ruby-client/blob/master/generated/google-apis-playcustomapp_v1/CHANGELOG.md
https://github.com/googleapis/google-api-ruby-client/blob/master/generated/google-apis-androidpublisher_v3/CHANGELOG.md

[joshdholtz]

@ainame The title of this PR says “drop Ruby 2.5” but its supposed to say “drop Ruby 2.4”, right? 😇

[ainame]

@joshdholtz That's right🙈 I fixed it.
If you review this PR, please do that for #18646 first, which this branch depends on 🙇

[joshdholtz]

This is the one!!! 🎊 I pulled this down and ran some tests on supply to make sure we are good and it seems like everything still works as it should 🤷‍♂️ Let's ship this!

[fastlane-bot]

Congratulations! 🎉 This was released as part of fastlane 2.183.0 🚀