config: make DOI optional

* closes CERNDocumentServer#163

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

@@ -90,3 +90,11 @@
     opacity:1;
   }
 }
+
+.ui.disabled.input, .ui.input:not(.disabled) input[disabled] {
+  opacity: 1 !important;
+}
+
+.ui.form .flashed.message {
+  z-index: 0 !important;
+}

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
@@ -189,6 +190,10 @@ 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/