Checking out the repository in Actions is slow

[ahouseholder]

It's taking over 20 minutes for each action to check out the repository before it can do anything. This results in every run of SearchRepos using basically 12 hours of compute time, and the vast bulk of that is checking out the repository. Probably time to optimize the process and see if we can make it more efficient.

[ahouseholder]

See also #17. Worth keeping this issue in mind when implementing that.

[ahouseholder]

The treeless clone idea in https://github.blog/2020-12-21-get-up-to-speed-with-partial-clone-and-shallow-clone/ might be relevant to solve this.

[ahouseholder]

This might be a duplicate of #7

[ahouseholder]

Checkout time is running around 40 minutes now.