write_felis_toml regenerates felis.host.toml and felis.pod.toml with a
wholesale `cat >`, and the [[auth_source]] list was a literal LittleSkin
block in that heredoc. Re-running the installer, which is also what
`felis setup` does, threw away any edit to the list: a root the operator
added stopped admitting logins, and a root they removed came back. The
generated comment invited exactly that edit.
Carry the tables forward the way [smtp] already is: read every
[[auth_source]] table from the existing felis.host.toml (falling back to
felis.pod.toml) and emit the LittleSkin default only when there is no
earlier file at all. An earlier file with no tables stays empty, because
that is a Mojang-only server rather than a missing value; felis-api now
treats an empty list that way.
The file header and the comment above the list now say what survives a
re-run, and point at felis.host.toml, which is what the next run reads.
bootstrap_test.sh extracts the new function from bootstrap.sh and checks
the fresh-install default, an operator's own table carried without the
default or the following section, an empty list staying empty, and the
indented form the setup TUI writes. It passes under dash with gawk and
with mawk; forcing the function to always return the default fails five
of the new cases.
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