How about a CI API call reduction?

[Hoverbear]

Description

Try to reduce the rate limiting issues we get on the Mac runners by reducing the amount we used Github Actions or their API at all.

Checklist

• Formatted with cargo fmt
• Built with nix build
• Ran flake checks with nix flake check
• Added or updated relevant tests (leave unchecked if not applicable)
• Added or updated relevant documentation (leave unchecked if not applicable)
• Linked to related issues (leave unchecked if not applicable)

Validating with install.determinate.systems

If a maintainer has added the upload to s3 label to this PR, it will become available for installation via install.determinate.systems:

curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix/pr/$PR_NUMBER | sh -s -- install

[Hoverbear]

Macs continue to exist, however container actions aren't supported on them. Will have to explore alternatives.

[Hoverbear]

So we'd need to load the cache from the linux runner and make the mac runner happen after.

[cole-h]

Seems fine, but I did mostly skim because YAML diffs are quite possibly the ugliest things to look at.