As an hosting company, I want to know the exact IPs used by WP Rocket SaaS so that I can allow-list them precisely

[MathieuLamiot]

Context
We provide a public list of IPs to allow for WP Rocket and its SaaS to behave as expected. However, this list contains IP ranges for group.One infrastructure, as we cannot be 100% sure about the IPs being used by their clusters.
However, some hosting companies and users with specific security plugins are not able to allow IP ranges.

The current list of IPs used by WP Rocket SaaS is available here.

The request for this GitHub issue comes from @DahmaniAdame here

Expected behavior
Provide an endpoint that returns all exact IPs used by our products without IP ranges.
This endpoint must not replace the existing, publicly documented (in our wp rocket online doc) one ; it should be an additional one.

The documentation about IP lists must be updated.

Additional information

• We might be able to automate retrieving the list from GitLab, but to be tested: GitLab is not accessible publicly, but it might be accessible from TB-TT as it is hosted on live1.