You should add the url to the repository in `odoo/custom/src/repos.yaml`. Like this:

# See https://github.com/Tecnativa/doodba#optodoocustomsrcreposyaml

./odoo:

  defaults:

    depth: $DEPTH_DEFAULT

  remotes:

    odoo: https://github.com/odoo/odoo.git

  target: odoo $ODOO_VERSION

  merges:

    - odoo $ODOO_VERSION

./oca_reporting_engine:

  defaults:

    depth: $DEPTH_DEFAULT

  remotes:

    main: https://github.com/OCA/reporting-engine.git

  target: main $ODOO_VERSION

  merges:

    - main $ODOO_VERSION