ci: publish docker image archives in release assets

.github/workflows/release-artifacts.yml

@@ -7,6 +7,7 @@ on:
 
 permissions:
   contents: write
+  packages: write
 
 jobs:
   build-and-upload:
@@ -72,6 +73,59 @@ jobs:
             rm -rf "${STAGE}"
           done
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=raw,value=${{ github.event.release.tag_name }}
+            type=raw,value=latest
+
+      - name: Build and Push Docker Image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+      - name: Export Docker image archives for release assets
+        run: |
+          set -euo pipefail
+          TAG="${{ github.event.release.tag_name }}"
+
+          docker buildx build \
+            --platform linux/amd64 \
+            --output type=docker,dest="dist/ds2api_${TAG}_docker_linux_amd64.tar" \
+            .
+
+          docker buildx build \
+            --platform linux/arm64 \
+            --output type=docker,dest="dist/ds2api_${TAG}_docker_linux_arm64.tar" \
+            .
+
+          gzip -f "dist/ds2api_${TAG}_docker_linux_amd64.tar"
+          gzip -f "dist/ds2api_${TAG}_docker_linux_arm64.tar"
+
+      - name: Generate checksums
+        run: |
+          set -euo pipefail
           (cd dist && sha256sum *.tar.gz *.zip > sha256sums.txt)
 
       - name: Upload Release Assets