Sometimes timeouts when downloading the installer

[lazka]

Over the last 2 weeks we get this occasionally:

Downloading MSYS2...
  connect ETIMEDOUT 185.199.110.133:443
  Waiting 12 seconds before trying again
  connect ETIMEDOUT 185.199.110.133:443
  Waiting 14 seconds before trying again
  Error: connect ETIMEDOUT 185.199.110.133:443

Example: https://github.com/msys2/msys2-tests/actions/runs/3453702969/jobs/5764508819

I wonder if we should store it in the cache as well to make this less likely.

[jeremyd2019]

I had a little hope that putting it in the "tool cache" might help (like, maybe once a new hosted image is updated, they might include it in the default tool cache), but I guess the "tool cache" only helps self-hosted?

I do know that the github cache service seems to be a real pain for my self-hosted runner (with not great internet), it tends to frequently (like every time if the cache is large) time out trying to upload to it

[lazka]

Maybe we can use three layers: tool cache -> github cache -> github download -> fail

[jeremyd2019]

Reminds me of #145 (comment)