Changes between 0.25.0 and 0.26.0

Fixed: multiple errors in src/overlord/jail.py:
- Fixed: IndexError: string index out of range.
- Fixed: NameError: name 'err' is not defined.
Added: metadata.include parameter:
-Added: OVERLORD_FILE and OVERLORD_WRKDIR environment variables.
Refactored: specification and config validation:
- In order to reduce repetitive code and unnecessary complexity, the validation of configuration and specification has been refactored and improved.
Added missing keywords for appjail-jail(1):
- Added: x11_display keyword.
- Added: xephyr_pid keyword.

Full Changelog: v0.25.0...v0.26.0

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