TemplateNotFound for Jinja2 when --jinja is a filename outside ./templates

[robertsonc]

Summary

preconfig.py hardcodes FileSystemLoader("templates"), so --jinja ec_preconfig_template.jinja2
fails unless the file is inside ./templates. This causes jinja2.exceptions.TemplateNotFound.

Expected behavior

--jinja should accept:

• an absolute path
• a relative path
• just a filename found in either . or ./templates

Actual behavior

Raises jinja2.exceptions.TemplateNotFound: ec_preconfig_template.jinja2 unless the file
exists in ./templates.

Steps to reproduce

1. Place ec_preconfig_template.jinja2 in the repo root (not in ./templates)

2. Run: python3 preconfig.py -c my-preconfig.csv --jinja ec_preconfig_template.jinja2 -o <orch_url>

3. Observe TemplateNotFound.

Proposed fix

Allow --jinja to be a path and search in ['<arg parent>', '.', 'templates']. Provide a clear
error message listing the directories searched.