chore: actually build ARM

.github/workflows/build.yml

@@ -18,7 +18,8 @@ env:
   DEFAULT_TAG: "latest"
   CENTOS_VERSION: "stream10"
   # PRs should only build for amd64.  The rest are pushed, so we should build for all platforms
-  PLATFORMS: ${{ github.event_name == 'pull_request' && 'amd64' || 'amd64, arm64' }}
+  # PLATFORMS: ${{ github.event_name == 'pull_request' && 'amd64' || 'amd64, arm64' }}
+  PLATFORMS: "amd64, arm64"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
@@ -43,7 +44,7 @@ jobs:
 
   build_push:
     name: Build and push image
-    runs-on: ${{ matrix.platform == 'amd64' && 'ubuntu-24.04' || 'ubuntu-24.04' }}
+    runs-on: ${{ matrix.platform == 'amd64' && 'ubuntu-24.04' || format('runs-on,runner=1cpu-linux-{0},run-id={1}', matrix.arch, github.run_id) }}
     needs: generate_matrix
     container:
       image: redhat/ubi9:latest