Added arm64 build (#4)

* Added arm64 build

.github/workflows/ci.yaml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@v4
       - uses: actions/setup-python@v5
       - uses: pre-commit/action@v3.0.1
-  artifacts:
+  build:
     name: "Build Artifacts"
     needs: pre-commit
     runs-on: ubuntu-latest
@@ -52,7 +52,7 @@ jobs:
   tagged-release:
     runs-on: ubuntu-latest
     if: github.ref_type == 'tag' && startsWith(github.ref_name, 'v')
-    needs: artifacts
+    needs: build
     steps:
       - name: Download artifacts from build stage
         uses: actions/download-artifact@v4
@@ -70,12 +70,28 @@ jobs:
   build-host-docker:
     name: "Build Host Software Docker Image"
     needs: pre-commit
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-24.04-arm, ubuntu-24.04 ]
+        include:
+          - os: ubuntu-24.04-arm
+            docker_build_arch: arm64
+          - os: ubuntu-24.04
+            docker_build_arch: amd64
     defaults:
       run:
         working-directory: ./host-software
     steps:
       - uses: actions/checkout@v4
+      - name: Prepare
+        env:
+          REPOSITORY: '${{ github.repository }}'
+        run: |
+          build_arch=${{ matrix.docker_build_arch }}
+          echo "BUILD_ARCH=${build_arch//\//-}" >> ${GITHUB_ENV}
+
+          echo "REPOSITORY_LC=${REPOSITORY,,}" >> ${GITHUB_ENV}
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/setup-buildx-action@v3
@@ -89,14 +105,81 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ghcr.io/${{ github.repository }}
+          images: ghcr.io/${{ github.REPOSITORY_LC }}
       - name: Build and push
         id: build-and-push
         uses: docker/build-push-action@v5
         with:
           context: host-software
-          tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          platforms: ${{ matrix.docker_build_arch }}
+          outputs: type=image,name=ghcr.io/${{ env.REPOSITORY_LC }},push-by-digest=true,name-canonical=true,push=true
           push: true
           cache-from: type=gha
           cache-to: type=gha,mode=max
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build-and-push.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.BUILD_ARCH }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+  merge:
+    runs-on: ubuntu-24.04
+    needs:
+      - build-host-docker
+    steps:
+      - name: Prepare
+        env:
+          REPOSITORY: '${{ github.repository }}'
+        run: |
+          echo "REPOSITORY_LC=${REPOSITORY,,}" >> ${GITHUB_ENV}
+
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          # generate Docker tags based on the following events/attributes
+          tags: |
+            type=edge,branch=main,prefix=releases-
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+          images: ghcr.io/${{ env.REPOSITORY_LC }}
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        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") \
+            $(printf 'ghcr.io/${{ env.REPOSITORY_LC }}@sha256:%s ' *)
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ghcr.io/${{ env.REPOSITORY_LC }}:${{ steps.meta.outputs.version }}