Problem Description: pulp_ansible will remove the `keyring` from repositories and replace it with a `gpgkey` field to hold the plain text of the public key instead of the path to a keyring on filesystem.

Where the change will affect:

Right now on Hub the `keyring` is set by running `django-admin set-repo-keyring` management command , which is set to run on every deployment via container entrypoint.

On integration tests the `keyring` is requested on repo endpoint to decide if test is skipped or not.

What are the actions needed to accommodate the change:

When upgrading to pulp_ansible version containing https://github.com/pulp/pulp_ansible/pull/1088/files 

• Change the `set-repo-keyring` command to read the keyring on filesystem and store its plain text public key on the repo.gpgkey instead of the path on `keyring` field.
• Set `settings.REQUIRE_SIGNATURE_VERIFICATION_ON_UPLOAD` (or so) new setting that will come with that PR

• Update documentation on upstream mentioning that the repo now takes a plain text public key instead of the path for a keyring