Go 1.20 "cold start" slows down CI pipeline stages due to first building stdlib

[TheDiveO]

As Go 1.20 doesn't ship anymore with prebuild stlib packages, the first build after installation will take longer. Obviously, in a full Kubernetes build this is negligible (if not outward laughable). But for many small CI Go build stages this probably eats considerably into CPU time and energy consumption.

For instance, a small module https://github.com/thediveo/caps/actions/runs/4197604787 takes around 36s for Go 1.19 versus Go 1.20 with 63s (times for "go test" phase only).

Now I'm curious: is there some way to "preheat" Go 1.20 in order to cache the locally built Go stdlib?

[Sean Liao]

- restore cache (go version as cache key)

- go build std

- save cache (GOCACHE)

- original build steps follow here

- sean

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[TheDiveO]

Many thanks!