Update Go version to 1.21.3 in gs autoscaler build pipeline #25

	name: Build and push Docker image for gridscale's Cluster Autoscaler

	on:
	push:
	tags:
	- "*"

	jobs:
	build-and-push:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Set up Go 1.21
	uses: actions/setup-go@v2
	with:
	go-version: 1.21.3

	- name: Change directory to cluster-autoscaler and build binary
	working-directory: ./cluster-autoscaler
	run: \|
	make build-arch-amd64

	- name: Login to Docker registry
	uses: docker/login-action@v1
	with:
	registry: registry.kubecuddle.io
	username: ${{ secrets.DOCKER_USERNAME }}
	password: ${{ secrets.DOCKER_PASSWORD }}

	- name: Build and push Docker image
	uses: docker/build-push-action@v2
	with:
	context: ./cluster-autoscaler
	file: ./cluster-autoscaler/Dockerfile.amd64
	push: true
	platforms: linux/arm64
	tags: registry.kubecuddle.io/k8s/cluster-autoscaler:${{ github.ref_name }}

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