Update CI to use SFT LCG
This updates the CI to use centrally provided LCG views and switches to clang 8.
@afiergol this is meanto replace the parts you changed in the CI in !54 (merged). Please revert your commits and rebase on this one.
This updates the CI to use centrally provided LCG views and switches to clang 8.
@afiergol this is meanto replace the parts you changed in the CI in !54 (merged). Please revert your commits and rebase on this one.