GitLab

for testing against upstream EPEL

[ci skip]

this should speed things up by reducing the number of times the package
cache needs to be updated, whilst ensuring the cache isn't present in
any layer and therefore should reduce the size of the container

[ci skip]

no need for separate containers for backports

also updates to osg-3.5

ius includes a lot more than just git and it is starting to cause
problems, switch to wandisco-git which just provides an updated git

[ci skip]

Change name of ligo ssh repository

See merge request !3

upstream variables take precedence in multi-project pipelines

use digest of previous version to stick with SL 7.6