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ci: add image build
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morremeyer committed Jun 7, 2024
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126 changes: 126 additions & 0 deletions .github/workflows/image.yml
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name: Build Docker image

on:
push:

# Run on pull requests to verify that the image still builds correctly
# The image is not pushed on pull requests
pull_request:
paths:
- Dockerfile

permissions:
packages: write

env:
REGISTRY_IMAGE: ghcr.io/gohugoio/hugo

jobs:
build:
runs-on: ubuntu-latest
strategy:
fail-fast: false
matrix:
platform:
- linux/amd64
- linux/arm64
steps:
- name: Prepare
run: |
platform=${{ matrix.platform }}
echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
- name: Checkout
uses: actions/checkout@v4.1.6

- name: Docker meta
id: meta
uses: docker/metadata-action@v5.5.1
with:
images: ${{ env.REGISTRY_IMAGE }}

- name: Set up QEMU
uses: docker/setup-qemu-action@v3.0.0

- name: Set up Docker Buildx
uses: docker/setup-buildx-action@v3.3.0

- name: Login to GHCR
# Login is only needed when the image is pushed
if: ${{ startsWith(github.ref, 'refs/tags') }}
uses: docker/login-action@v3.2.0
with:
registry: ghcr.io
username: ${{ github.repository_owner }}
password: ${{ secrets.GITHUB_TOKEN }}

- name: Build and push by digest
id: build
uses: docker/build-push-action@v5.3.0
with:
context: .
push: ${{ startsWith(github.ref, 'refs/tags') }}
platforms: ${{ matrix.platform }}
labels: ${{ steps.meta.outputs.labels }}
outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true

- name: Export digest
run: |
mkdir -p /tmp/digests
digest="${{ steps.build.outputs.digest }}"
touch "/tmp/digests/${digest#sha256:}"
- name: Upload digest
uses: actions/upload-artifact@v4.3.3
with:
name: digests-${{ env.PLATFORM_PAIR }}
path: /tmp/digests/*
if-no-files-found: error
retention-days: 1

merge:
runs-on: ubuntu-latest
needs:
- build
if: ${{ startsWith(github.ref, 'refs/tags') }}
steps:
- name: Download digests
uses: actions/download-artifact@v4.1.7
with:
path: /tmp/digests
pattern: digests-*
merge-multiple: true

- name: Set up Docker Buildx
uses: docker/setup-buildx-action@v3.3.0

- name: Docker meta
id: meta
uses: docker/metadata-action@v5.5.1
with:
images: ${{ env.REGISTRY_IMAGE }}

flavor: |
latest=false
# Tag the image with the v-prefixed semver version on tags, tag with the ref on PRs
tags: |
type=semver,pattern={{raw}}
type=ref,event=pr
- name: Login to GHCR
uses: docker/login-action@v3.2.0
with:
registry: ghcr.io
username: ${{ github.repository_owner }}
password: ${{ secrets.GITHUB_TOKEN }}

- name: Create manifest list and push
working-directory: /tmp/digests
run: |
docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
$(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)
- name: Inspect image
run: |
docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}

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