config: make DOI optional

* closes CERNDocumentServer#163

assets/less/cds-rdm/globals/site.overrides

@@ -89,4 +89,4 @@
   &:focus{
     opacity:1;
   }
-}
+}

invenio.cfg

@@ -37,6 +37,7 @@ from invenio_cern_sync.users.profile import CERNUserProfileSchema
 from invenio_oauthclient.views.client import auto_redirect_login
 from invenio_cern_sync.sso import cern_remote_app_name, cern_keycloak
 
+from invenio_rdm_records.config import RDM_PERSISTENT_IDENTIFIERS, RDM_PARENT_PERSISTENT_IDENTIFIERS
 from invenio_vocabularies.config import VOCABULARIES_NAMES_SCHEMES as DEFAULT_VOCABULARIES_NAMES_SCHEMES
 
 def _(x):  # needed to avoid start time failure with lazy strings
@@ -182,13 +183,17 @@ APP_RDM_DEPOSIT_FORM_AUTOCOMPLETE_NAMES = 'search'  # "search_only" or "off"
 # Invenio-RDM-Records
 # ===================
 # See https://inveniordm.docs.cern.ch/customize/dois/
-DATACITE_ENABLED = False
+DATACITE_ENABLED = True
 DATACITE_USERNAME = ""
 DATACITE_PASSWORD = ""
 DATACITE_PREFIX = ""
 DATACITE_TEST_MODE = True
 DATACITE_DATACENTER_SYMBOL = ""
 
+RDM_PERSISTENT_IDENTIFIERS["doi"]["required"] = False
+RDM_PERSISTENT_IDENTIFIERS["doi"]["ui"]["default_selected"] = "not_needed"  # "yes", "no" or "not_needed"
+RDM_PARENT_PERSISTENT_IDENTIFIERS["doi"]["required"] = False
+
 # Authentication - Invenio-Accounts and Invenio-OAuthclient
 # =========================================================
 # See: https://inveniordm.docs.cern.ch/customize/authentication/
@@ -500,8 +505,7 @@ RDM_RECORDS_PERSONORG_SCHEMES = {**RDM_RECORDS_PERSONORG_SCHEMES,
 ### Do not require DOIs for record and parent
 RDM_PERSISTENT_IDENTIFIERS["doi"]["required"] = False
 RDM_PARENT_PERSISTENT_IDENTIFIERS["doi"]["required"] = False
-
-
+RDM_PERSISTENT_IDENTIFIERS["doi"]["ui"]["default_selected"] = "not_needed"  # "yes", "no" or "not_needed"
 # Invenio-Preservation-Sync
 # =========================