docker build of script_exporter fails

[miroslav-vulovic]

The docker build of script_exporter using the latest version of Docker file fails with:

docker build --tag script_exporter .
Sending build context to Docker daemon 162.3kB
Step 1/16 : FROM golang:1.14.1-alpine AS build-env
---> 760fdda71c8f
Step 2/16 : RUN apk add --update git gcc libc-dev
---> Using cache
---> 3dc61b9aff23
Step 3/16 : RUN go get -u github.com/prometheus/promu
---> Running in e1d625b930e8
package github.com/google/go-github/v25/github: cannot find package "github.com/google/go-github/v25/github" in any of:
/usr/local/go/src/github.com/google/go-github/v25/github (from $GOROOT)
/go/src/github.com/google/go-github/v25/github (from $GOPATH)
The command '/bin/sh -c go get -u github.com/prometheus/promu' returned a non-zero code: 1