Scaling Golang CI by Replacing actions/setup-go

Hey everyone, one of the authors here. This is a "small" improvement that has saved us a LOT of developer time over the last few months. It's actually quite crazy to me that the default actions/setup-go simply does not work well if you want to have more than one golang action running at the same time.

The blogpost has a lot of technical details, but you can also just read the code and try it yourself:

https://github.com/cloudx-io/setup-go