Add Gitlab CI

I reviewed the issue and code.

The .gitlab-ci.yml looks good, I ran it through cs-lint on gitlab, and it passed.
Status:
Syntax is correct. CI configuration validated, including all configuration added with the include keyword.

I did have a question about the commit to "Remove test files that are not testing Workflow Buttons functionality" - did you intent to remove all the test files?

Will leave this issue as needs review. Let me know if there are other actions that need to be done to verify this issue.

Thanks for the review wylbur! I started trying to fix the tests, and when I looked into them deeper, it appeared to me that the tests had been copied from elsewhere, and were not testing the functionality of this module. We need a follow-up issue to add some test coverage for the module.

@ultrabob, after spending some time trying to get test working, I totally agree with you! I'll create a new issue, and work on some fixes. Let's stick with deleting tests here, and working on this on a new issue. I'm marking this as RTBC, but let me know if this needs more input.

Thanks!

@wylbur thanks a lot for your work on this. It looks like at this point we only have three minor phpstan warnings left, which we could add to the baseline and try to fix later, but given that they don't look like hard issues, I think I want to fix them so we can start with fully passing gitlab-ci.

Workflow Buttons now passes all linting and code analysis with no warnings or errors. There is another issue for adding tests, given that the existing tests were not testing Workflow Buttons features.

Automatically closed - issue fixed for 2 weeks with no activity.