This PR adds a python 3.12 image and fixes the build of the legacy 3.7 image.
Also, the way that cmsml is installed initially into the images is slightly changed.
So far, the master branch of the repo was fetched and installed. This, however, leads to problems when actually developing new features on other branches.
Now, the repository present on the host system is copied in the build process and installed as is.
This PR adds a python 3.12 image and fixes the build of the legacy 3.7 image.
Also, the way that cmsml is installed initially into the images is slightly changed.
master
branch of the repo was fetched and installed. This, however, leads to problems when actually developing new features on other branches.