only build amd images

.github/workflows/image-build.yaml

@@ -17,7 +17,7 @@ on:
 ## Define which docker arch to build for
 env:
   # docker_platforms: "linux/arm64, linux/amd64, linux/arm/v7, linux/amd64/v3, linux/arm64/v8"
-  docker_platforms: "linux/arm64, linux/amd64"
+  docker_platforms: "linux/amd64/v3, linux/amd64"
   docker-org: blockstack
 
 concurrency:
@@ -33,7 +33,6 @@ jobs:
   ##  - workflow is building default branch (master)
   image:
     name: Build Image
-    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       ## Build a maximum of 2 images concurrently based on matrix.dist
@@ -45,6 +44,8 @@ jobs:
           - signer
           - emily-server
           - blocklist-client
+
+    runs-on: ubuntu-latest
     steps:
       ## Setup Docker for the builds
       - name: Docker setup