Kevin Veen-Birkenbach
37ac22e0b4
test: isolate Nix store/cache per distro to fix cross-distro manifest conflicts
- Replace shared Nix volumes with distro-specific volumes
(pkgmgr_nix_store_<distro>, pkgmgr_nix_cache_<distro>)
- Prevent incompatible profile manifest versions between Ubuntu and Debian
- Update all test scripts (unit, integration, container, e2e)
- Remove unused global Nix volume variables from Makefile
- Improve consistency of test-e2e.sh formatting and environment handling
- Add Git safe.directory configuration for mounted /src to avoid ownership warnings