I have a golang monorepo that is structured roughly like this:

pkg
..go.mod 
..lib.go
service
..go.mod
..main.go
..Dockefile

Services are importing pkg with the replace directive

replace github.com/my/repo/pkg => ../pkg

Thus, I cannot set a root directory as /service since then it won't be able to access ../pkg.

I don't want to let it go the the github and download the code from there from inside the building container since in this case I would have to have quite an unenjoyable hustle with github access tokens and it also kinda negates the benefits of having a monorepo.

Alternatives that i consider:

• using vendor (also seems kinda stupid inside a monorepo)

• building images outside Railway and deploying from external registry

But since those are clearly suboptimal I wonder: is it possible to make this work with custom build command? Should be so, I guess, but I haven't found any documentation about what this command should be. The only example is for JS.

Should it be go build...? Or docker build? Or something else? I also don't mind moving my dockerfiles from services' individual folders to the root if this is needed to provide them with the correct context. But I just don't know what the command should be.

I'll appreciate if you would help with this since I really liked the feel of Railway I want to continue using it.