also do multi platform on release w/ burnettk

.github/workflows/release_builds.yml

@@ -16,6 +16,8 @@ jobs:
     steps:
       - name: Check out the repository
         uses: actions/checkout@v3.3.0
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       - name: Log in to the Container registry
         uses: docker/login-action@v2.1.0
         with:
@@ -37,6 +39,7 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
 
   create_backend_docker_image:
     runs-on: ubuntu-latest
@@ -49,6 +52,8 @@ jobs:
     steps:
       - name: Check out the repository
         uses: actions/checkout@v3.3.0
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       - name: Log in to the Container registry
         uses: docker/login-action@v2.1.0
         with:
@@ -70,6 +75,7 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
 # Is this getting updated, I wonder?
   create_demo-proxy:
     runs-on: ubuntu-latest
@@ -83,6 +89,8 @@ jobs:
     steps:
       - name: Check out the repository
         uses: actions/checkout@v3.3.0
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       - name: Log in to the Container registry
         uses: docker/login-action@v2.1.0
         with:
@@ -104,6 +112,7 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
 
   quickstart-guide-test:
     runs-on: ubuntu-latest