Arvados

These are the hooks that run on every PR, and block merging until they pass. Since Travis started limiting their free tier, this has become a major blocker to merging PRs. We can use GitHub actions instead.

https://github.com/common-workflow-language/cwltool

https://github.com/common-workflow-language/schema_salad

The general idea for these tests is to use `tox` as much as possible, so any changes in that direction are welcome.

Someone has started this at https://github.com/common-workflow-language/cwltool/pull/1411, make sure not to duplicate effort.

Relevant links:

• https://docs.travis-ci.com/user/languages/java/ (and https://travis-ci.com/github/common-workflow-language/cwlviewer/builds/206265984)
• https://docs.github.com/en/actions/guides/building-and-testing-java-with-maven
• https://docs.github.com/en/actions/quickstart
• https://docs.github.com/en/actions/learn-github-actions/migrating-from-travis-ci-to-github-actions