docs: Add reference on partition/overlay env vars

Metadata

Project: craft-parts
Number: #1048
Type: pull request
State: open
Author: upils
Labels: —
Created: 2025-03-20 09:59:31+00:00
Updated: 2025-03-26 16:11:58+00:00
Closed: —

Current evaluation

No evaluation has been recorded for this issue yet.

Issue body

- [ ] Have you signed the [CLA](http://www.ubuntu.com/legal/contributors/)? - [ ] Have you added an entry to the changelog (`docs/reference/changelog.rst`)? -----

Evaluation history

No evaluation history available.