idhub: add envs for idhub namespace

.env.example

@@ -10,5 +10,14 @@
 # specially useful if you want to deploy in a specific domain
 #MUSICIAN_API_BASE_URL='https://orchestra.example.org'
 #MUSICIAN_ALLOWED_HOSTS='musician.example.org'
+# IDHUB
+####
+
+#IDHUB_SECRET_KEY='uncomment-it-and-fill-this'
+IDHUB_USER='admin'
+IDHUB_PASSWD='admin'
+IDHUB_EMAIL='admin@example.org'
+# enable dev flags when DEVELOPMENT deployment
+IDHUB_DEPLOYMENT='DEVELOPMENT'
 # adapt to your domain in a production/reverse proxy env
 IDHUB_CSRF_TRUSTED_ORIGINS='https://idhub.example.org'