Trigger image build when requirements change (#5770) #6

	name: Build Images

	on:
	push:
	branches: ['main']
	paths:
	- "code-samples/serving/hello-world/helloworld-go/**"
	- "docs/serving/autoscaling/autoscale-go/**"
	- "hack/docker/**"
	- ".github/workflows/knative-docs-image.yaml"
	- "requirements.txt"

	jobs:
	build-and-push-image:
	name: Build Knative Images
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2

	- name: Log in to the Container registry
	uses: docker/login-action@v1
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build mkdocs image
	uses: docker/build-push-action@v4
	with:
	push: true
	file: ./hack/docker/Dockerfile
	tags: ghcr.io/knative/knative-docs:latest

	- name: Build helloworld-go image
	uses: docker/build-push-action@v4
	with:
	push: true
	platforms: linux/amd64,linux/arm64
	context: ./code-samples/serving/hello-world/helloworld-go
	tags: ghcr.io/knative/helloworld-go:latest

	- name: Build autoscale-go image
	uses: docker/build-push-action@v4
	with:
	push: true
	platforms: linux/amd64,linux/arm64
	context: ./docs/serving/autoscaling/autoscale-go
	tags: ghcr.io/knative/autoscale-go:latest

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