Migrate to nixica 0.1.0
Summary
Full nixica migration for horizon-supported-systems:
- Replace
flake-parts+import-tree+get-flakewithnixica.lib.mkFlake - Replace archived
gitlab-omnix-ciwithgitlab-ci0.19.0 - Add
mkPartitionModuledev partition atnix/partitions/dev.nix - Restructure tests to
test/modules/flake/horizon-supported-systems/it-*/convention - Update
.gitlab-ci.ymlremote template to 0.19.0
Part of Tier 3 work tracked in nixica#3 (closed) (prioritised by @locallycompact).