Base URL is not set

[strugee]

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Steps to reproduce

1. Set up a docker-socket-proxy deploy target, make sure the test deploy is working properly, and then deploy Windmill with occ
2. Open the Windmill workspace and let it automatically set stuff up
3. Create a new Windmill flow and add an Approval/Prompt step
4. Test the flow you just made

Expected behaviour

The output of the approval step should be a URL live on the internet.

Actual behaviour

The approval step outputs:

{
    "enums": {},
    "resume": "https://localhost/api/w/nextcloud/jobs_u/resume/<redacted UUID>/<redacted number>/<redacted long presumably-secret random token>?approver=approver1",
    "default_args": {}
}

This is fixed by going into Windmill "Instance settings" and setting the base URL under "Core" to https://<Nextcloud base URL>/index.php/apps/app_api/proxy/flow.

Server configuration

Web server: Apache

Database: MySQL

PHP version: not sure, I can find out if it matters, but this seems N/A

Nextcloud version: 30.0.6

(Omitting list of installed apps etc. which pretty obviously isn't relevant)

Browser

N/A