I'll consede that his point in using docker was to avoid the "it works on my computer" problem. It was literally one of his talking points in his handover meeting. But that is not the problem docker is trying to solve, and not it's strength.

Docker and similar container software makes many things very convenient, and has uses far outside it's originally intended usage.

And in this situation, when want stable package versions, and simpler uniform setup. And you don't have stable package versions because docker doesn't provide reproducible builds (and he didn't do the work work srojdn that), and it is not a simpler setup when you want to use the hosts ssh agent with ssh inside docker, which require different steps for different distros, Mac and Idk if windows would have worked? And sharing your ssh agent into the docker image is not stable either even if you set it up, it isn't sure to work the next reboot. And can be every difficult in some Linux distros due to permissions, etc.

Then I ended up putting it on a vm, that is already used for utilities. If I were to do it today, I would probsbly use nix, to actually run these programs that is very sensitive to program version changes in a stable reproducible environment that can run on any Linux distro, including in docker

But the program had many more issues, like editing yaml files by catting them and piping them into tac and piping into sed and then into tac again... And before you say you could do that just with one sed command, sure, but the sane solution is to use yq. Let's just say that was the tip of the iceberg

Oh and just have to note, claimed working features, but no way for that code the be executed, and when I actually tried to hook up this code, I can't believe its ever fully worked.