Add the persistent_by_default configuration option

fix #3293

When biboumi is logging into journald, use sd_journal_send

This makes sure that multi-lines messages are properly parsed as a single
message by journald.

fix #3268

Mark messages from the IRC server as private and no-copy

fix #3284

Remove a forgotten and useless comment

[skip-ci]

Update the Archive documentation, regarding the previous commit

Add support for the "history" node on MUC join

Supports the "seconds", "maxstanzas", "since" and "maxchars" (but only =0)
attributes.

fix #3270

In fixed mode, server messages come from biboumi’s hostname directly

Instead of irc.example.com@biboumi, because that’s actually user named
“irc.example.com”, in that case.
And that fixes the raw messages in fixed mode.

fix #3286

Add an index for the muc_log_line table

This immensely speeds up the archive select queries.

fix #3292

Cache the encoding_in database value, to avoid doing a query for each message

Small refactor in on_quit()

Don’t forget to remove the user from the channel, when kicked

fix #3291

Add an e2e test to demonstrate bug #3291

Change docker documentation regarding the database permissions

fix #3290

Fix a sqlite3 leak when the database fails to open

Display the correct error message when we fail to open the sqlite3 db

fix #3290

Build the docker image with --no-cache, --pull

ci: debian branch, pull the debian branch before trying to merge with master

Re-add a removed (by mistake) pointer null check

Fix the hostname of test3.biboumi.louiz.org

Allow failures of packaging jobs