Tiny CI server to run bids-validator using Gitea webhooks
Results are placed in %(GITEA_CUSTOM)/public/bids-validator/;
this folder needs to be writable (and ideally created first and owned)
by the user running this daemon.
It assumes the URL %(ROOT_URL)s/static/assets/ loads from
Gitea's %(GITEA_CUSTOM)/public/; it is not compatible
with configuring Gitea's %(STATIC_URL_PREFIX) so that
static files are hosted on a different server or CDN.