Where to copy vendor to the go docker builder?

[K Prayogo]

I'm trying to make docker build faster for software that are built with golang

tried to cache layer but it still slow when dependency changed since go mod download have to redownload whole dependency again and again.

how to make use vendor directory on docker  build? (where to copy? so go build or go mod download/go mod vendor inside Dockerfile so it doesn't redownload agian and again)?

I've tried to copy whole vendor, but it still redownloading

tried to copy vendor to $GOPATH/pkg/mod, but it also still redownloading

tried to copy vendor to $GOPATH/pkg/mod/cache/download, but it still redownloading

where the correct way to put vendor directory?

https://stackoverflow.com/questions/69020535/how-to-prevent-docker-build-from-redownloading-copied-golang-vendor

[Sean Liao]

If you already ran `go mod vendor` outside of docker then there's no need for multilayer caching

COPY . .

RUN go build 

[Chris Burkert]

Would it help to set up your own module proxy e.g. with 

https://github.com/gomods/athens or 

https://github.com/goproxy/goproxy?

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