The github action we were using had to be rebuilt on each build, we now
start from base go 1.14 and just download the golangci-tool and run it.
This saves around 20-30 seconds on each build.
* Run in parallel
* lint
* test/build/e2e test
* use cache for go
* do not use docker for building
* remove useless dependencies from the base image
Build time passes from 5 minutes to 1 minute 30 seconds