build: add gha cache for go and docker #338
Merged
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This PR introduces go and docker caching into the github actions.
In addition, there is now docker layer caching available, so the non-golang layers will also be cached, which can speed up the builds from 12 to 10 minutes.
It uses a hash of go.mod - so if no golang changes are made, the cache is available to the build to use, which can speed up builds from 10 to 2 minutes.