Allow .sops.yaml to live in a parent directory

[snstanton]

Sops is unfortunately a little simplistic in how it looks for the .sops.yaml file. It expects the file to exist in the current working directory and then compares paths relative to that. I would like to collect my .sops.yaml files into a single configuration at the top of my tree to make it easier to share keys with patterns. I haven't found any way to do this that also works with helm-secrets.

Ideally helm-secrets would walk up the parent directories from the secrets.yaml file to find the .sops.yaml and then write the appropriate sops command relative to that directory.