app manager (docker/weblate): use new `files` feature to set `settings-override.py`: This file is used to set `USE_X_FORWARDED_HOST`, which is necessary to make Weblate work correctly being an Apache (and potentially other HTTP servers) reverse proxy (otherwise we have CSRF errors, cf. https://github.com/WeblateOrg/weblate/issues/1912).

#!/bin/bash
set -e

usermod -u "$(stat -c %u /var/lib/prosody/.)" prosody

if [[ "$1" != "prosody" ]]; then
    exec prosodyctl "$@"
    exit 0;
fi

if [ "$LOCAL" -a  "$PASSWORD" -a "$DOMAIN" ] ; then
    prosodyctl register "$LOCAL" "$DOMAIN" "$PASSWORD"
fi

exec runuser -u prosody -- "$@"