ci: setup multi-arch image build

Author: cheatsnake

.github/workflows/docker-image.yml

@@ -13,6 +13,9 @@ jobs:
             - name: Checkout code
               uses: actions/checkout@v3
 
+            - name: Set up Docker Buildx
+              uses: docker/setup-buildx-action@v3
+
             - name: Log in to Docker Hub
               uses: docker/login-action@v3
               with:
@@ -24,4 +27,5 @@ jobs:
               with:
                   context: .
                   push: true
+                  platforms: linux/amd64,linux/arm64
                   tags: cheatsnake/airstation:latest