302 error on Gitlab in AMI docker setup

[lakshya-skyfall]

Facing an issue following the AMI setup. I am only interested in setting up the Shopping Admin and Gitlab websites and followed the following:

docker start gitlab
docker start shopping_admin

docker exec shopping_admin php /var/www/magento2/bin/magento config:set admin/security/password_is_forced 0
docker exec shopping_admin php /var/www/magento2/bin/magento config:set admin/security/password_lifetime 0

docker exec shopping_admin /var/www/magento2/bin/magento setup:store-config:set --base-url="http://<your-server-hostname>:7780"
docker exec shopping_admin mysql -u magentouser -pMyPassword magentodb -e  'UPDATE core_config_data SET value="http://<your-server-hostname>:7780/" WHERE path = "web/secure/base_url";'
docker exec shopping_admin /var/www/magento2/bin/magento cache:flush

docker exec gitlab update-permissions
docker exec gitlab sed -i "s|^external_url.*|external_url 'http://<your-server-hostname>:8023'|" /etc/gitlab/gitlab.rb
docker exec gitlab gitlab-ctl reconfigure

However, doing curl -s -o /dev/null -w "GitLab (8023): %{http_code}\n" http://$HOSTNAME:8023 throws a 302 status code instead of 200.

How can I get around this?