Distribute aarch64 Linux tarball builds (#1664)

.github/workflows/dockerbuild.yaml

@@ -2,7 +2,7 @@ name: Dockerbuild
 on:
     workflow_dispatch: {}
     push:
-        branches: [master, develop]
+        branches: [master, staging, develop]
         paths:
             - "dockerbuild/**"
 concurrency: ${{ github.workflow }}-${{ github.ref_name }}
@@ -19,6 +19,14 @@ jobs:
         steps:
             - uses: actions/checkout@v4
 
+            - name: Set up QEMU
+              uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3 # v3
+
+            - name: Set up Docker Buildx
+              uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3
+              with:
+                  install: true
+
             - name: Log in to the Container registry
               uses: docker/login-action@5f4866a30a54f16a52d2ecb4a3898e9e424939cf
               with:
@@ -41,3 +49,4 @@ jobs:
                   push: true
                   tags: ${{ steps.meta.outputs.tags }}
                   labels: ${{ steps.meta.outputs.labels }}
+                  platforms: linux/amd64,linux/arm64