Merge pull request #12539 from cameronbrunner/issue-11902-mac-iso-build

Update MacOS ISO build steps

Makefile

@@ -312,7 +312,7 @@ ifeq ($(IN_DOCKER),1)
 else
 	docker run --rm --workdir /mnt --volume $(CURDIR):/mnt $(ISO_DOCKER_EXTRA_ARGS) \
 		--user $(shell id -u):$(shell id -g) --env HOME=/tmp --env IN_DOCKER=1 \
-		$(ISO_BUILD_IMAGE) /usr/bin/make out/minikube.iso
+		$(ISO_BUILD_IMAGE) /bin/bash -lc '/usr/bin/make out/minikube.iso'
 endif
 
 iso_in_docker:

deploy/iso/minikube-iso/Dockerfile

@@ -15,7 +15,8 @@
 FROM ubuntu:18.04
 
 RUN apt-get update \
-	&& apt-get install -y apt dpkg apt-utils ca-certificates \
+	&& apt-get install -y apt dpkg apt-utils ca-certificates software-properties-common \
+	&& add-apt-repository -y ppa:longsleep/golang-backports \
 	&& apt-get upgrade -y \
 	&& apt-get install -y \
 		build-essential \