Adds Scouts Online 3 (login.scouting.nl) as an OIDC source. Its userinfo
has the member's roles within the group; a property mapping puts every
member in "MBG leden" and those with an active Kaderlid role also in
"MBG kader", on every login. Members become external users. Family
members can share an email address and immich needs a unique one, so
those get a plus address with their member number.
The immich provider now authenticates through a flow whose only stage
is an identification stage with this one source and no fields, which
sends people straight on to Scouts Online. The source's own flows only
run through the source.
The Scouting MBG photos (immich) will log in through this authentik,
which later passes on Scouts Online. The provider issues immich_role and
immich_quota: admins and the members of "MBG kader" may upload (-1),
everyone else gets a quota of 0, which makes immich refuse uploads.
"MBG leden" and "MBG kader" are filled by the Scouts Online source in a
next step; until then only authentik Admins can use the app.
The scouting blueprints and their secrets are mounted as directories
rather than with subPath, and the blueprint reads the client secret with
!File instead of !Env, so later changes reach authentik without a restart.
Ruben Hensen