You need a version of Hugo installed to build the site, e.g.:

go install github.com/gohugoio/hugo@latest

To prepare the test data:

cd script
./gen.sh

To build the site with Hugo, do something like this from the root of the repository:

HUGO_MEMORYLIMIT=8 hugo --logLevel info

Note that HUGO_MEMORYLIMIT is in GB. If not set, it defaults to the quarter of the total system memory. Also note that Hugo has some hidden flags that may be useful in this context:

• --profile-cpu=<filename>
• --profile-mem=<filename>
• --profile-mutex=<filename>