Using a relative path for KITOPS_HOME interacts strangely with context path in pack

[amisevsk]

Describe the bug

Setting KITOPS_HOME to a relative path and running kit pack with an alternate context directory will result in KITOPS_HOME resolving within that context directory instead of the directory you're calling kit from. This leads to strange behaviour, where after building a modelkit, it will not be visible in kit list

To Reproduce

1. Set KITOPS_HOME=.kitops-storage
2. Pack a modelkit using a context path: kit pack -t <tag> ./path/to/model
3. Path .kitops-storage is created, but does not contain blobs; kit list returns nothing
4. Note that ./path/to/model/.kitops-storage has been created and contains the blobs

Version
nightly

Additional context
N/A