Follows up from #2096, #2097

* add --init to suggested docker run invocations

See #2096; this should fix unreaped zombies when using an auth-script or
ip-check-script that spawns its own subprocesses, then exits before reaping
them.

* add a note on why --init

bump irctest

Fix typo in ACCOUNT_NAME_MUST_BE_NICK code

* changelog for v2.12.0-rc1

* bump date

upgrade go-ident

Fixes a socket leak (that doesn't seem to be affecting tilde.town?)

* Fix #1997 (allow the use of an external file for the email blacklist)
* Change config key names for blacklist (compatibility break)
* Accept globs rather than regexes for blacklist by default
* Blacklist comparison is now case-insensitive

explicit docker.io in Dockerfile

See #2082

implement draft/no-implicit-names

bump go to v1.21

add channel autojoin feature

See discussion on #2077

Import AppArmor profile

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

upgrade to irc-go v0.4.0

fix #2013

See #2013; given that plaintext is deprecated now, it seems like there is no
added value from continuing to police this.

Dockerfile: `apk upgrade` before `add`

The base golang image ships with some packages pre-installed,
but they're not necessarily the latest. If we try to add a
package that (transitively) depends on one of the existing ones,
it'll fail if it's expecting a newer version.

To address this, simply `apk upgrade` before trying to `apk add`.

Closes #2071

fix incorrect chathistory batch types

This was introduced in 38a6d17ee5

some cleanups