Parameterize Workflow Runners #42

One other thing I thought of is that ubuntu-slim imposes a hard 15-minute job limit and one CPU on every caller and so I'm wondering if it would be worth it to add a string runner input defaulting to the current default runners (ubuntu-latest/ubuntu-latest), and use runs-on: ${{ inputs.runner }} to change from the default. Just a thought.

Yeah... I noticed that in the docs and don't agree with the disparity (single cpu => 15 minutes, anything else => 6 hours), but rules are rules I suppose.

I'll make it parameterized as requested. Should I add any warnings? I've always been of the mindset that unit tests should only take a few minutes, while integration + e2e tests go for any sane number of hours.

Originally posted by @seantronsen in #38 (comment)