Describe the bug

Using Docker for a standalone WordCamp.org installation, I was unable to create a new site for a WordCamp.

To reproduce

Steps to reproduce the behavior:

1. Follow the instructions at Using Docker for a standalone WordCamp.org installation in the section under Initial Setup.
2. Browse to https://central.wordcamp.test/wp-admin/ and login if necessary
3. Go to WordCamps > Add New
4. Create a new WordCamp "Ryan 2022"
5. Advance the site through the status to "In Pre-Planning"
6. Enter the site URL https://ryan.wordcamp.test/2022/ and check the box to Create site in network
7. Add the ryan.wordcamp.test host in my hosts file
8. Browse to https://ryan.wordcamp.test/2022/
9. See a "Too many redirects" browser message

Expected behavior

I'd see the new site I just created.