[cherry-pick][release-1.12]Add go clean in Dockerfile and action. #145

	name: build Velero containers on Dockerfile change

	on:
	pull_request:
	branches:
	- 'main'
	- 'release-**'
	paths:
	- 'Dockerfile'

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	name: Checkout

	- name: Set up QEMU
	id: qemu
	uses: docker/setup-qemu-action@v1
	with:
	platforms: all

	- name: Set up Docker Buildx
	id: buildx
	uses: docker/setup-buildx-action@v1
	with:
	version: latest

	# Although this action also calls docker-push.sh, it is not triggered
	# by push, so BRANCH and TAG are empty by default. docker-push.sh will
	# only build Velero image without pushing.
	- name: Make Velero container without pushing to registry.
	if: github.repository == 'vmware-tanzu/velero'
	run: \|
	./hack/docker-push.sh

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