[ci] Offloading CI versioning to argotest.

This commits simplifies the CI setup for this repository, offloading
all complexity to the "argotest" repository.
7 jobs from offloading-ci in 1 second (queued for 3 seconds)
Status Job ID Name Coverage
  Build
failed #16740
integration
containers.build

00:00:00

failed #16741
integration
libnrm.build

00:00:00

failed #16742
integration
nrm.build

00:00:00

 
  Test
skipped #16743
integration
integration.test
skipped #16744
integration
TestHello.test
skipped #16745
integration
TestListen.test
skipped #16746
integration
TestPerfwrapper.test
 
Name Stage Failure
failed
nrm.build Build
Running on slave-desktop...
Fetching changes...
HEAD is now at e5398ce [ci] Offloading CI versioning to argotest.
Checking out e5398ce6 as offloading-ci...
Skipping Git submodules setup
$ CACHE=$(mktemp -d --suffix=nixcache /tmp/deletable-nix-cache-XXXX)
$ XDG_CACHE_HOME=$CACHE nix-build .nix -A nrm
error: getting status of '/var/lib/gitlab-runner/builds/9da9b53c/0/argo/containers/.nix': No such file or directory
ERROR: Job failed: exit status 1
failed
libnrm.build Build
Running on slave-desktop...
Fetching changes...
HEAD is now at e5398ce [ci] Offloading CI versioning to argotest.
Checking out e5398ce6 as offloading-ci...
Skipping Git submodules setup
$ CACHE=$(mktemp -d --suffix=nixcache /tmp/deletable-nix-cache-XXXX)
$ XDG_CACHE_HOME=$CACHE nix-build .nix -A libnrm
error: getting status of '/var/lib/gitlab-runner/builds/9da9b53c/0/argo/containers/.nix': No such file or directory
ERROR: Job failed: exit status 1
failed
containers.build Build
 - [deleted]         (none)     -> origin/fail-empty-sets
- [deleted] (none) -> origin/fix-kill-content
* [new branch] offloading-ci -> origin/offloading-ci
Checking out e5398ce6 as offloading-ci...
Skipping Git submodules setup
$ CACHE=$(mktemp -d --suffix=nixcache /tmp/deletable-nix-cache-XXXX)
$ XDG_CACHE_HOME=$CACHE nix-build .nix -A containers
error: getting status of '/var/lib/gitlab-runner/builds/9da9b53c/0/argo/containers/.nix': No such file or directory
ERROR: Job failed: exit status 1