Custom migration scripts for a core module used to require copying the
whole module into ``versions/18.0/addons/`` so its ``migrations/`` folder
would be picked up. Because the migration container mounts that copy with
priority (``--addons-path=mig,addons``) and ``get_module_path`` returns the
first match, the copy fully shadowed the core module — dragging along its
entire data/models just to carry one script.
Instead, inject the scripts through a dedicated OpenUpgrade ``upgrade_path``:
- New ``versions/18.0/scripts/l10n_fr_account/18.0.2.2/`` holding
``pre-migration-0k-fix-orphan-expressions.py`` (converted to the
``@openupgrade.migrate()`` / ``migrate(env, version)`` convention) and
``post-migration-0k-vat-box25.py`` + ``noupdate_changes.xml`` that reapply
the box 25 VAT-report customization via ``openupgrade.load_data``.
- ``config/compose.yml``: mount it as ``/opt/odoo/auto/upgrade`` for ou18.
- ``versions/18.0/upgrade.sh``: pass
``--upgrade-path=/opt/odoo/auto/upgrade,/opt/odoo/auto/addons/openupgrade_scripts/scripts``.
Odoo appends every path to ``odoo.upgrade.__path__`` and concatenates the
per-version scripts, so our scripts run IN ADDITION to the native ones;
the native path is listed explicitly because ``--upgrade-path`` overrides
``config['upgrade_path']`` which ``openupgrade_framework`` only sets when empty.
Files are named with a ``-0k-`` marker so they never collide with the native
``pre-migration.py`` / ``post-migration.py``. This removes the need for the
shadowing module copy entirely.
Also ignore ``__pycache__``/``*.pyc``.
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