Summary:
Now that webhook payload delivery can be done using a proxy,
it may be desirable to no longer require a set of `ALLOWED_WEBHOOK_DOMAINS`.
This diff allows this variable to be set to `*`. With this setting,
any domain, and both `http` and `https` protocols will now be accepted.
Another possibility would be to default to unchecked
behavior if `ALLOWED_WEBHOOK_DOMAINS` is not set. But this would
introduce a new kind of vulnerability to unconfigured Grist
installations.
Test Plan: switched a test from naming a domain to using `*`
Reviewers: jarek
Reviewed By: jarek
Differential Revision: https://phab.getgrist.com/D3903
3f3a0d3aa1