gitlab-ci: use different build caches/docker images for different branches
gitlab-ci: use different build caches/docker images for different branches

looooo/netgen,looooo/netgen,looooo/netgen,looooo/netgen,live-clones/netgen,looooo/netgen,live-clones/netgen,live-clones/netgen,live-clones/netgen,live-clones/netgen,looooo/netgen,live-clones/netgen