I don’t use those plugins:
2 │ discourse_plugins:
3 │ - https://github.com/discourse/docker_manager
4 │ - https://github.com/discourse/discourse-rss-polling
5 │ - https://github.com/discourse/discourse-chat-integration
6 │ - https://github.com/discourse/discourse-yearly-review
7 │ - https://github.com/discourse/discourse-perspective-api
8 │ - https://github.com/discourse/discourse-policy
9 │ - https://github.com/discourse/discourse-shared-edits
10 │ - https://github.com/discourse/discourse-akismet
11 │ - https://github.com/discourse/discourse-solved
12 │ - https://github.com/discourse/discourse-user-notes
13 │ - https://github.com/discourse/discourse-templates
14 │ - https://github.com/discourse/discourse-assign
15 │ - https://github.com/discourse/discourse-docs
16 │ - https://github.com/discourse/discourse-encrypt
17 │ - https://github.com/discourse/discourse-cakeday
18 │ - https://github.com/discourse/discourse-calendar
19 _ │ - https://github.com/discourse/discourse-data-explorer
20 │ - https://github.com/kees-closed/discourse-group-custom-fields
21 │ - https://github.com/discourse/discourse-activity-pub
I do use MaxMind, so maybe that might be the issue. I also commented out the non-Discourse plugin. That didn’t solve the issue, so I don’t think it is due to a non-official plugin.
I also rebooted the container host, no effect on the build outcome. In the past a networking issue was resolved by a reboot.