Use Gitlab container registry

Part 1 out of 3 of #2896:

• Part 1 is !12
• Part 2 is utopie!3053
• Part 3 is nextup-deploy!52

Changes:

• Use podman instead of docker to build the images, the base image is quay.io/podman/stable:v5.5 (ie the current latest for podman/stable)
• Use the Gitlab container registry of this project to store base images
• Remove maven, maven-and-node and maven-and-chrome images
• Add chrome (created from former maven-and-chrome image) and podman images