Add script to centralise golang version update #850

	name: validation
	on: [push, pull_request]
	env:
	GO111MODULE: "on"
	PROJECTNAME: "watermarkpodautoscaler"
	GO_VERSION: 1.21
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Set up Go
	uses: actions/setup-go@v1
	with:
	go-version: ${{ env.GO_VERSION }}
	id: go
	- name: Install required packages
	uses: mstksg/get-package@v1
	with:
	apt-get: mercurial jq build-essential
	- name: Check out code into the Go module directory
	uses: actions/checkout@v1
	- name: Install tools
	run: \|
	make install-tools
	- name: Run build
	run: \|
	make manager
	- name: Run unit/control plane tests (fake cluster)
	run: \|
	make test
	e2e:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	k8s:
	- v1.14.10
	- v1.16.9
	- v1.18.4
	- v1.21.1
	steps:
	- name: Set up Go
	uses: actions/setup-go@v1
	with:
	go-version: ${{ env.GO_VERSION }}
	id: go
	- name: Install required packages
	uses: mstksg/get-package@v1
	with:
	apt-get: mercurial jq build-essential
	- name: Check out code into the Go module directory
	uses: actions/checkout@v1
	- name: Install tools
	run: \|
	make install-tools
	- name: Setup kind for e2e - kube ${{ matrix.k8s }}
	uses: helm/[email protected]
	with:
	config: test/cluster-kind.yaml
	cluster_name: wpa-e2e-test
	- name: Run e2e tests - kube ${{ matrix.k8s }}
	run: \|
	export PATH=$PATH:$(pwd)/bin
	kubectl cluster-info --context kind-wpa-e2e-test
	kubectl get pods -n kube-system
	make e2e

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