Re-enable arm64

Author: jc21

scripts/ci/build-backend

@@ -70,7 +70,7 @@ docker pull "${IMAGE}"
 #build_backend "darwin" "amd64"
 #build_backend "darwin" "arm64"
 build_backend "linux" "amd64"
-#build_backend "linux" "arm64"
+build_backend "linux" "arm64"
 build_backend "linux" "arm"
 #build_backend "openbsd" "amd64"
 #build_backend "windows" "amd64"