chore(repo): try creating multi-platform

.github/workflows/ci.yml

@@ -18,10 +18,6 @@ jobs:
     needs: test
     steps:
       - uses: actions/checkout@v4
-      - name: Install Nixpacks
-        run: |
-          curl -LO https://github.com/railwayapp/nixpacks/releases/download/v1.27.1/nixpacks-v1.27.1-amd64.deb
-          sudo dpkg -i nixpacks-v1.27.1-amd64.deb
       - uses: oven-sh/setup-bun@v2
       - run: bun i --no-save
       - run: bun run build
@@ -33,7 +29,9 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Tag image
-        run: docker tag $(docker images --format='{{.ID}}' | head -1) ghcr.io/palladians/klesia:$(git rev-parse --short HEAD)
-      - name: Push to GHCR
-        run: docker push ghcr.io/palladians/klesia:$(git rev-parse --short HEAD)
+      - name: Build and push Docker images
+        uses: iloveitaly/github-action-nixpacks@main
+        with:
+          platforms: "linux/amd64,linux/arm64"
+          push: true
+          tags: ghcr.io/palladians/klesia:$(git rev-parse --short HEAD)