build: Set ulimit on container

This was necessary on some machines.

build/build

@@ -46,6 +46,7 @@ main() {
     --env GIT_COMMIT_TIME=$SOURCE_DATE_EPOCH \
     --env GIT_HEAD=$rev \
     --env RADICLE_VERSION=$version \
+    --ulimit=nofile=131072:1048576 \
     --arch amd64 --tag $image -f ./build/Dockerfile - < $gitarchive
 
   echo "Creating container (radicle-build-container).."