Allow List-ID in decoration template URIs
Template expansions for headers and footers (i.e. decorations) allow for the FQDN list name and the preferred language code. Since List-ID is more stable than list name, those should be allowed too.
The 17.0 major release is coming on May 16, 2024! This version brings many exciting improvements to GitLab, but also removes some deprecated features. We are introducing three breaking change windows during which we expect breaking changes to be deployed to GitLab.com. You can read more about it on our blogpost. The third breaking change window begins 2024-05-06 09:00 UTC and ends 2024-05-08 22:00 UTC.
Template expansions for headers and footers (i.e. decorations) allow for the FQDN list name and the preferred language code. Since List-ID is more stable than list name, those should be allowed too.