Migrate CI from Travis CI to GitHub Actions

mishina2228 commented 2 years ago

Since June 15th, 2021, the building on travis-ci.org is ceased. This PR adds GitHub Actions workflows. Here are the details:

Tests were being run on multiple patch versions(like 2.4.1, 2.4.5 and 2.4.6), now only the latest patch version will be tested.
ruby/setup-ruby does not support Rubinius(rbx-2), so rbx-2 is not included in the CI matrix.
Use Bundler v1.x for Rails 4 and earlier.
The versions of Ruby and Rails in the test targets are outdated, but I migrated them as is.
Comparison of CI jobs:
- Travis CI https://travis-ci.org/github/nathanvda/cocoon
- GitHub Actions https://github.com/mishina2228/cocoon/actions/runs/1765938505

nathanvda commented 2 years ago

Wow, great work. I will have to/want to look at this in a little more detail. Thanks a lot!

mishina2228 commented 2 years ago

Once this PR is merged, I'll be happy to send PRs to clean up Travis and add new Ruby/Rails tests 😄

nathanvda / cocoon