fix: OCI model pull

[lorenzofelletti]

Fixes

Model provider was not getting passed the function's directory, so it was trying to pull the module in / as opposed to /cue-resources.

kustomize build --enable-alpha-plugins --network .
processing filter: failed to get CUE model from provider: failed to fetch from OCI registry: failed to perform "Push" on destination: failed to ensure directories of the target path: mkdir /cue.mod: permission deniedError: couldn't execute function: exit status 1