Add support for RedHat 8

[stevenzerbe]

Pull Request (PR) description

Enable RHEL8 operatingsystem_support

This Pull Request (PR) fixes the following issues

[puppet-community-rangefinder]

nginx::package::redhat is a class

that may have no external impact to Forge modules.

nginx::params is a class

Breaking changes to this file MAY impact these 1 modules (near match):

• braiins-wordpressnginx

This module is declared in 9 of 579 indexed public Puppetfiles.

---

These results were generated with Rangefinder, a tool that helps predict the downstream impact of breaking changes to elements used in Puppet modules. You can run this on the command line to get a full report.

Exact matches are those that we can positively identify via namespace and the declaring modules' metadata. Non-namespaced items, such as Puppet 3.x functions, will always be reported as near matches only.

[stevenzerbe]

@ghoneycutt requested I ping them for review.

[ekohl]

Please also add CentOS 8 to the list of supported OSes. That gives us acceptance tests.

[stevenzerbe]

CentOS 8 added to operatingsystem_support for testing.

[ghoneycutt]

Merged as the spec tests are passing and the failing acceptance tests were already failing and are unrelated to this change.

[smortex]

FYI, the passenger repo is really not working on CentOS Stream:

Error: 
 Problem: cannot install the best candidate for the job
  - nothing provides rubygem(rack) needed by passenger-6.0.14-1.el8.x86_64
(try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)

Will remove support for it in #1502 (where I am attempting to fix CI).