> And I mean sure, everything is kinda janky on Jenkins, but everything falls into an expectable corridor of jank you get used to.

Self-hosting Jenkins on an EC2 instance is probably going to result in a _better_ experience at this point. Github Cache is barely better than just downloading assets directly, and with Jenkins you can trivially use a local disk for caching.

Or if you're feeling fancy and want more isolation, host a local RustFS installation and use S3 caching in your favorite tools.