AlmaLinux 8 Support In script.rpm.sh

Presently the install.rpm.sh script for GitLab and GitLab Runner do not recognize AlmaLinux 8 as an EL distro.

ie:

[root@CT114 ~]# curl -L "https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.rpm.sh" | sudo bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  6904  100  6904    0     0  33843      0 --:--:-- --:--:-- --:--:-- 33843
Detected operating system as almalinux/8.
Checking for curl...
Detected curl...
Downloading repository file: https://packages.gitlab.com/install/repositories/runner/gitlab-runner/config_file.repo?os=almalinux&dist=8&source=script
curl: (22) The requested URL returned error: 404 


Unable to download repo config from: https://packages.gitlab.com/install/repositories/runner/gitlab-runner/config_file.repo?os=almalinux&dist=8&source=script

This usually happens if your operating system is not supported by 
packagecloud.io, or this script's OS detection failed.

You can override the OS detection by setting os= and dist= prior to running this script.
You can find a list of supported OSes and distributions on our website: https://packages.gitlab.com/docs#os_distro_version

For example, to force CentOS 6: os=el dist=6 ./script.sh

If you are running a supported OS, please email support@packagecloud.io and report this.

@lfaus at ATO Raleigh said this was the best place to report this issue.

I'm happy to contribute the code for the fix but I couldn't find this script/file in a repository anywhere, only on the copy of it that resides on Packagecloud. If there's a repo for this file somewhere please point me in that direction and I'll make a PR.