upgrade memory to resolve oom

deployment/check/common/deployerNode.nix

@@ -40,7 +40,7 @@ in
       ## default. These values have been trimmed down to the gigabyte.
       ## Memory use is expected to be dominated by the NixOS evaluation,
       ## which happens on the deployer.
-      memorySize = 4 * 1024;
+      memorySize = 5 * 1024;
       diskSize = 4 * 1024;
       cores = 2;
     };