gitlab.com will start limiting Free tier to CI/CD 400 minutes/month

On Sept 2, GitLab announced that, starting October 1, gitlab.com will start limiting CI/CD minutes in the Free tier to 400 minutes per group per month: https://about.gitlab.com/releases/2020/09/01/ci-minutes-update-free-users/. External runners do not count toward this quota.

https://gitlab.com/simp currently uses the Free tier to run CI, notably acceptance tests. The group would certainly be affected by this change—a single representative run of the simp/simp module's pipeline took 418 minutes on its own: https://gitlab.com/simp/pupmod-simp-simp/-/pipelines/96363092, most of using gitlab.com's CI/CD resources in the spec/unit test portion.

We have some options:

1. Sign SIMP up to GitLab's Open Source Program, which grants qualified open source groups Gold tier status (50000 CI/CD min)

2. Change SIMP projects' CI pipeline jobs to run on OP-hosted GLCI runners (unfeasible due to resource constraints)

3. Change SIMP projects' GLCI pipelines to run only the OP-hosted acceptance tests, and trigger them using another CI service (GitHub Actions/Travis CI) after running the lint+spec stages