lambda doesnt support manifest image

Author: sorah

.github/workflows/docker-attendee-gate.jsonnet

@@ -1 +1,21 @@
-(import './docker-build-simple.libsonnet')('attendee-gate', 'us-west-2')
+(import './docker-build-simple.libsonnet')('attendee-gate', 'us-west-2') {
+  jobs+: {
+    merge+: {
+      steps+: [
+        {
+          name: 'Push arm64 tag for Lambda',  // doesnt support manifest
+          run: |||
+            dgst="$(docker buildx imagetools inspect --raw -t "${REPO}:${SHA}" | jq -r '.manifests[] | select(.platform.architecture == "arm64" and .platform.os == "linux") | .digest')"
+            docker tag  "${REPO}@${dgst}" "${REPO}:${SHA}-arm64"
+            docker push "${REPO}:${SHA}-arm64"
+          |||,
+          env: {
+            REPO: std.format('${{ steps.login-ecr.outputs.registry }}/%s', 'attendee-gate'),
+            SHA: '${{ github.sha }}',
+          },
+        },
+      ],
+
+    },
+  },
+}