Branch-Off: Improve process to get EC2 AMIs updated on time

By contacting Amine a week earlier. Long term we should replace Amine
by a script.

Related: #56

src/Branch-Off.md

@@ -163,5 +163,15 @@ The following steps should be done after the channels have become available on [
 
 1. Give the [Marketing team](https://matrix.to/#/#marketing:nixos.org) a heads-up about the upcoming release
 
+1. Get in contact with [Amine Chikhaoui](https://github.com/AmineChikhaoui) on the infrastructure room on Matrix, so
+ they can get the AMIs updated in time for the release.
+
+ 1. They will need to run [`create-amis.sh`](https://github.com/NixOS/nixpkgs/blob/master/nixos/maintainers/scripts/ec2/create-amis.sh`),
+ which requires write permissions to the S3 bucket.
+
+ 1. Create PR adding it to NixOS configuration. Examples:
+ - [22.11](https://github.com/NixOS/nixpkgs/pull/204014)
+ - [20.09](https://github.com/NixOS/nixpkgs/pull/101720)
+
 1. Update the ZHF issue, that now that the branch-off has been performed, fixes have to be backported.
  Examples: [22.05](https://github.com/NixOS/nixpkgs/issues/172160#issuecomment-1135112918)

src/Final-Release.md

@@ -140,7 +140,7 @@
  nix-shell -p "python3.withPackages (p: [ p.lxml p.requests p.pytest ])" -p cdrkit osinfo-db-tools gettext --run "make check"
  ```
 
-1. Update AMI images
+1. Make sure the AMI images have been updated
 
  1. Someone with s3 bucket permssions will need to run `https://github.com/NixOS/nixpkgs/blob/master/nixos/maintainers/scripts/ec2/create-amis.sh` (usually AmineChikhaoui - just ping them in the infrastructure matrix room).