apt-key is deprecated (Docker building)

[veredCyto]

Hi, while trying to build the docker image for CKG i got an error messege:
"ERROR: failed to solve: process "/bin/sh -c apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 51716619E084DAB9" did not complete successfully: exit code: 2"
I think this is because apt-key command is deprecated.
Can you update the DockerFile with an updated command?
Thanks.

[KastanDay]

I got a slightly different error when building the Dockerfile:

$ docker build -t docker-ckg:latest .

 => ERROR [11/78] RUN python3 get-pip.py                                                                                                                      0.3s
------
 > [11/78] RUN python3 get-pip.py:
0.241 ERROR: This script does not work on Python 3.7. The minimum supported Python version is 3.8. Please use https://bootstrap.pypa.io/pip/3.7/get-pip.py instead.
------
Dockerfile:50
--------------------
  48 |     ## pip upgrade
  49 |     RUN wget https://bootstrap.pypa.io/get-pip.py
  50 | >>> RUN python3 get-pip.py
  51 |     RUN pip3 install --upgrade pip
  52 |     RUN pip3 install setuptools
--------------------
ERROR: failed to solve: process "/bin/sh -c python3 get-pip.py" did not complete successfully: exit code: 1

Anyone have any advice? The CKG docs say python 3.7 is required, but the docker build script is failing.