minikube: Unable to build minikube ISO locally

Is this a BUG REPORT or FEATURE REQUEST? (choose one): BUG REPORT

Environment: Fedora 25 (Linux)

Docker version 1.12.6

What happened: I am unable to generate minikube ISO with instruction here https://github.com/kubernetes/minikube/blob/master/docs/contributors/minikube_iso.md#build-instructions.

Getting permission error: Getting following error:

$ make buildroot-image
docker build  -t gcr.io/k8s-minikube/buildroot-image -f deploy/iso/minikube-iso/Dockerfile deploy/iso/minikube-iso/
Sending build context to Docker daemon 114.2 kB
Step 1 : FROM ubuntu:16.04
 ---> ccc7a11d65b1
[...]
Successfully built 7d9ff5ca90dc

gcr.io/k8s-minikube/buildroot-image successfully built

$ make out/minikube.iso
docker run --rm --workdir /mnt --volume /home/budhram/gowork/src/github.com/kubernetes/minikube:/mnt  \
  --user 1001:1001 --env HOME=/tmp --env IN_DOCKER=1 \
  gcr.io/k8s-minikube/buildroot-image /usr/bin/make out/minikube.iso
make: stat: Makefile: Permission denied
make: *** No rule to make target 'out/minikube.iso'.  Stop.
Makefile:125: recipe for target 'out/minikube.iso' failed
make: *** [out/minikube.iso] Error 2

# Checking inside container
$ docker run --rm --workdir /mnt --volume /home/budhram/gowork/src/github.com/kubernetes/minikube:/mnt  \
> --user 1001:1001 --env HOME=/tmp --env IN_DOCKER=1 \
> -it gcr.io/k8s-minikube/buildroot-image bash
groups: cannot find name for group ID 1001
I have no name!@38b0831a053f:/mnt$ ls
ls: cannot open directory '.': Permission denied

I doubt the volume mount didn’t happen properly.

What you expected to happen: minikube ISO should be generated at out/minikube.iso.