Disable Gitea user-pass login

Closes #11

Not quite sure if disabling basic authentication will break anything ('auth to tokens API, but not tokens').

gitea/application.yaml

@@ -195,6 +195,10 @@ spec:
               value: "true"
             - name: GITEA__CRON__ENABLED
               value: "true"
+            - name: ENABLE_BASIC_AUTHENTICATION
+              value: "false"
+            - name: ENABLE_PASSWORD_SIGNIN_FORM
+              value: "false"
             - name: GITEA__OAUTH2_CLIENT__ENABLE_AUTO_REGISTRATION
               value: "true"
             - name: GITEA__DATABASE__PASSWD