Greenify sepa tests

This is not what `env` should be used for.

You can export `PATH` in the `before_install` section.

`env` should be used to set up different build environments.
ex:

```
- ODOO=https://github.com/odoo/odoo`
- ODOO=https://github.com/OCA/OCB`
```

To run the build twice, once with odoo, once with OCB