[Samba] Container setup - selftests not running?

[Joachim Lindenberg]

Hi Louis,
thanks for the offer. I am kind of struggling with the 5th step you didn´t
mention -- apt-get install samba results in 4.7.6  (likely from ubuntu?),
but I have no clue how to specify the version or enforce using your
repository.
For reference, these are the instructions I am using (note that sudo is not
required in container builds, and step 3 was optional - and didn´t change
anything):
apt-get update && apt-get -y install apt-transport-https gnupg wget
net-tools
wget -O - https://apt.van-belle.nl/louis-van-belle.gpg-key.asc | apt-key add
-
echo "deb http://apt.van-belle.nl/ubuntu  bionic-samba410 main contrib
non-free"  | tee -a /etc/apt/sources.list.d/van-belle.list
apt-get install -y samba
samba -V
Thanks & Best Regards, Joachim