To build the site for previewing, you'll need to set the following environment variables:
DISCOVERDOTNET_GITHUB_TOKEN, which can be obtained via creating a personal access token with
DISCOVERDOTNET_MEETUP_TOKEN, which can be obtained by visiting the Meetup API key page.
Then run the following command:
build -target preview
This will build the site locally using a few items from each type of data and allow you to preview it (watch the output for the URL, but usually it's http://localhost:5080).