Odoo does not initialize the database by default,
it must be explicitly initialized for the test as written to succeed.
Signed-off-by: Sirio Balmelli <sirio@b-ad.ch>
This contribution adds `odoo15` as a fixed version. To allow reusing the
existing test for Odoo, I made the package attribute configurable. To
reference the test for `odoo15` in `passthru` I added it to
`all-tests.nix`.
