Companion to https://github.com/canonical/craft-providers/pull/900 When the cache dir is mounted from the LXD host, hardlinking from the global cache (uv's default behavior) is not possible e.g. ``` :: warning: Failed to hardlink files; falling back to full copy. This may lead to degraded performance. :: If the cache and target directories are on different filesystems, hardlinking may not be supported. :: If this is intentional, set `export UV_LINK_MODE=copy` or use `--link-mode=copy` to suppress this warning. ```