[ci/fix] update ci to fix env issues

The nix-env used for CI is being poluted by gitlab CI environ variables,
which ends up crashing argo_nodeos_config.

The real fix would be probably involve figuring out what kind of env
variable value crashes the whole thing and fixing our wrapping logic,
but at the same time, there's no reason for nix to use the CI env in the
first place.

This also resets the CI pointers to 'base'/'basic.yaml'.
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