plugin app manager docker: use default emails for weblate: when `email_from` was not set in `sat.conf`, no value was set for `WEBLATE_SERVER_EMAIL` and `WEBLATE_DEFAULT_FROM_EMAIL`. These environment variables are needed for Weblate to be launched, so default value are now used (the same as the one from official Weblate Docker image).

#!/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 -- "$@"