Unable to build Docker image: cannot find package gobuffalo/validate

[ryanerwin]

Running docker build fails

docker build .

Error:

Step 8/16 : RUN go get $(go list ./... | grep -v /vendor/)
 ---> Running in a6541d3d0389
../buffalo/render/helpers.go:10:2: cannot find package "github.com/gobuffalo/tags" in any of:
        /usr/local/go/src/github.com/gobuffalo/tags (from $GOROOT)
        /go/src/github.com/gobuffalo/tags (from $GOPATH)
models/band.go:8:2: cannot find package "github.com/gobuffalo/validate" in any of:
        /usr/local/go/src/github.com/gobuffalo/validate (from $GOROOT)
        /go/src/github.com/gobuffalo/validate (from $GOPATH)
The command '/bin/sh -c go get $(go list ./... | grep -v /vendor/)' returned a non-zero code: 1