The vhost half of this change is only useful with an account behind it,
and the provider is generated with an empty user set on purpose. Document
the `swarmctl user add` step rather than automating it: bootstrapping an
IdP non-interactively means a secret arriving from a file, an env var or a
nix expression, all worse than one command typed once.
The gateway and network pages gain the rows they would otherwise be
missing — vhost map, local-dev hosts entry, and the resolver's
authoritative-name list.
The question this answers is "what do I have to configure, and where" —
so the table of secrets is the deliverable and the prose is scaffolding
around it.
The organising idea worth keeping: a secret belongs in-container when
nothing outside that container reads it. Every one of authelia's own
secrets passes that test; the client secret's plaintext fails it, which
is what makes delivery a problem at all rather than a detail.
