Adding pipeline to build this image for arm64, amd64 and s390x

Signed-off-by: Rafael Zago <[email protected]>

.github/workflows/build-multiarch.yml

@@ -0,0 +1,27 @@
+---
+name: Build and Push Multi-Arch Image
+on: [push]
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Quay
+        run: |
+          echo "${{ secrets.QUAY_TOKEN }}" | docker login quay.io -u "${{ secrets.QUAY_USER }}" --password-stdin
+
+      - name: Build and Push Multi-Arch Image
+        run: |
+          docker buildx build \
+            --platform linux/amd64,linux/arm64,linux/s390x \
+            -t quay.io/rzago/lanyard:latest \
+            --push .