Checklist

• I added a descriptive title
• I searched open requests and couldn't find a duplicate

What is the idea?

We should be testing the code in this repository to catch potential bugs and verify our assertions about what the software should do.

Why is this needed?

This will help prevent bugs and validate future bug removals.

What should happen?

• Add an action runner that will be run for all pull requests and merges to main (like it's done for conda/conda)
• Add some trivial tests for some of the modules to lay the ground work for future tests. Let's do this for the actions where custom Python code lives for starters:
  • combine-durations
  • template-files

Additional Context

No response