Create default user

https://github.com/alexbelgium/hassio-addons/issues/528

paperless_ngx/rootfs/etc/cont-init.d/99-run.sh

@@ -1,11 +1,37 @@
 #!/usr/bin/with-contenv bashio
 # shellcheck shell=bash
 
-# Staring redis
+#################
+# Staring redis #
+#################
 exec redis-server & bashio::log.info "Starting redis"
 
-# Avoid overcommit memory
+###########################
+# Avoid overcommit memory #
+###########################
 bashio::log.info "Avoid overcommit memory"
 sysctl vm.overcommit_memory=1
 
+###############################
+# Create user if not existing #
+###############################
+# Origin : https://github.com/linuxserver/docker-paperless-ngx/blob/main/root/etc/cont-init.d/99-migrations
+bashio::log.info "Creating default user"
+cat << EOF | python3 /app/paperless/src/manage.py shell
+from django.contrib.auth import get_user_model
+
+# see ref. below
+UserModel = get_user_model()
+
+if len(UserModel.objects.all()) == 1:
+    print("Creating new user")
+    user = UserModel.objects.create_user('admin', password='admin')
+    user.is_superuser = True
+    user.is_staff = True
+    user.save()
+EOF
+
+#########
+# Start #
+#########
 bashio::log.info "Initial username and password are admin. Please change in the administration panel of the webUI after login."