CI: Drop slc6

Conflicts:
	.gitlab-ci.yml
	eos-folly-deps.spec
12 jobs for master in 1 minute and 48 seconds (queued for 1 second)
Status Name Job ID Coverage
  Deps
canceled deps-c8 #12538922

00:01:47

canceled deps-cc7 #12538921

00:01:48

canceled deps-fedora-32 #12538923

00:01:47

canceled deps-fedora-32-tsan #12538924

00:01:47

failed deps-fedora-rawhide #12538925

00:00:13

 
  Build
canceled c8 #12538927

canceled cc7 #12538926

canceled fedora-32 #12538928

canceled fedora-32-tsan #12538929

canceled fedora-rawhide #12538930

 
  Publish
canceled publish #12538931
docker_node

canceled publish-critical #12538932
docker_node allowed to fail manual

 
Name Stage Failure
failed
deps-fedora-rawhide Deps
Initialized empty Git repository in /builds/eos/eos-folly/.git/
Created fresh repository.
Checking out 0bfb73ea as master...

Skipping Git submodules setup
Executing "step_script" stage of the job script
shell not found
Cleaning up file based variables
ERROR: Job failed: exit code 1