From 00f95b6daa5be85203f23685b106e39738406229 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emrik=20=C3=96stling?= <emrikos@chalmers.se>
Date: Fri, 23 May 2025 12:24:47 +0200
Subject: [PATCH] ci: merge images

---
 .github/workflows/docker-publish.yml | 184 +++++++++++++++++++--------
 1 file changed, 130 insertions(+), 54 deletions(-)

diff --git a/.github/workflows/docker-publish.yml b/.github/workflows/docker-publish.yml
index 0c5f9b1..d08e1a3 100644
--- a/.github/workflows/docker-publish.yml
+++ b/.github/workflows/docker-publish.yml
@@ -1,88 +1,164 @@
 name: Docker
 
-# This workflow uses actions that are not certified by GitHub.
-# They are provided by a third-party and are governed by
-# separate terms of service, privacy policy, and support
-# documentation.
+# thanks to https://github.com/sredevopsorg/multi-arch-docker-github-workflow
 
 on:
   push:
-    branches: [ "main" ]
-    # Publish semver tags as releases.
-    tags: [ 'v*.*.*' ]
+    branches: ["main"]
+    tags: ["v*.*.*"]
   pull_request:
-    branches: [ "main" ]
+    branches: ["main"]
   workflow_dispatch:
-
 env:
-  # Use docker.io for Docker Hub if empty
-  REGISTRY: ghcr.io
-  # github.repository as <account>/<repo>
+  GHCR_IMAGE: ghcr.io/c4illin/convertx
   IMAGE_NAME: ${{ github.repository }}
   DOCKERHUB_USERNAME: c4illin
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
-   build:
-    runs-on: ${{ matrix.runner }}
+  # The build job builds the Docker image for each platform specified in the matrix.
+  build:
     strategy:
+      fail-fast: false
       matrix:
-        platform: [amd64, arm64]
-        include:
-          - platform: amd64
-            runner: ubuntu-24.04
-          - platform: arm64
-            runner: ubuntu-24.04-arm
+        platform:
+          - linux/amd64
+          - linux/arm64
+
     permissions:
-      contents: read
+      contents: write
       packages: write
+      attestations: write
+      checks: write
+      actions: read
+
+    runs-on: ${{ matrix.platform == 'linux/amd64' && 'ubuntu-24.04' || matrix.platform == 'linux/arm64' && 'ubuntu-24.04-arm' }}
+
+    name: Build Docker image for ${{ matrix.platform }}
 
     steps:
+      - name: Prepare environment for current platform
+        # This step sets up the environment for the current platform being built.
+        # It replaces the '/' character in the platform name with '-' and sets it as an environment variable.
+        # This is useful for naming artifacts and other resources that cannot contain '/'.
+        # The environment variable PLATFORMS_PAIR will be used later in the workflow.
+        id: prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      # Workaround: https://github.com/docker/build-push-action/issues/461
-      - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@v3
-
-      # Login against a Docker registry except on PR
-      # https://github.com/docker/login-action
-      - name: Log into registry ${{ env.REGISTRY }}
-        if: github.event_name != 'pull_request'
-        uses: docker/login-action@v3
+      - name: Docker meta default
+        id: meta
+        uses: docker/metadata-action@v5
         with:
-          registry: ${{ env.REGISTRY }}
+          images: ${{ env.GHCR_IMAGE }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3.10.0
+        with:
+          platforms: ${{ matrix.platform }}
+
+      - name: Login to GitHub Container Registry
+        # here we only login to ghcr.io since the this only pushes internal images
+        uses: docker/login-action@v3.4.0
+        with:
+          registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      
-      - name: Login to Docker Hub
-        if: github.event_name != 'pull_request'
-        uses: docker/login-action@v3
-        with:
-          username: ${{ env.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      # Extract metadata (tags, labels) for Docker
-      # https://github.com/docker/metadata-action
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6.16.0
+        env:
+          DOCKER_BUILDKIT: 1
+        with:
+          context: .
+          platforms: ${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          annotations: ${{ steps.meta.outputs.annotations }}
+          outputs: type=image,name=${{ env.GHCR_IMAGE }},push-by-digest=true,name-canonical=true,push=true,oci-mediatypes=true
+          cache-from: type=gha,scope=${{ matrix.platform }}
+          cache-to: type=gha,mode=max,scope=${{ matrix.platform }}
+
+      - 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
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    name: Merge Docker manifests
+    runs-on: ubuntu-latest
+
+    permissions:
+      attestations: write
+      contents: read
+      packages: write
+
+    needs:
+      - build
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
       - name: Extract Docker metadata
         id: meta
         uses: docker/metadata-action@v5
         with:
           images: |
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+            ${{ env.GHCR_IMAGE }}
             ${{ env.IMAGE_NAME }}
 
-      # Build and push Docker image with Buildx (don't push on PR)
-      # https://github.com/docker/build-push-action
-      - name: Build and push Docker image
-        id: build-and-push
-        uses: docker/build-push-action@v6
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
         with:
-          context: .
-          platforms: linux/${{ matrix.platform }}
-          push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
-      
\ No newline at end of file
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ env.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Get execution timestamp with RFC3339 format
+        id: timestamp
+        run: |
+          echo "timestamp=$(date -u +"%Y-%m-%dT%H:%M:%SZ")" >> $GITHUB_OUTPUT
+
+      - 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") \
+            --annotation='index:org.opencontainers.image.description=${{ github.event.repository.description }}' \
+            --annotation='index:org.opencontainers.image.created=${{ steps.timestamp.outputs.timestamp }}' \
+            --annotation='index:org.opencontainers.image.url=${{ github.event.repository.url }}' \
+            --annotation='index:org.opencontainers.image.source=${{ github.event.repository.url }}' \
+            $(printf '${{ env.GHCR_IMAGE }}@sha256:%s ' *)
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect '${{ env.GHCR_IMAGE }}:${{ steps.meta.outputs.version }}'