Add initial support for CentOS 9

[kajinamit]

Pull Request (PR) description

This is an attempt to introduce initial support for CentOS 9, and fixes
the missing gpg key file for CentOS 9.

This Pull Request (PR) fixes the following issues

n/a

[ekohl]

Right now I'm wondering why it isn't kicking off CI for CentOS 9 Stream. It should be.

[ekohl]

I just opened #135 to remove EL6. It gives some impression of what should be done to add EL9.

[kajinamit]

I think we need voxpupuli/puppet_metadata#36 to enable CentOS9 job.

[kajinamit]

I just opened #135 to remove EL6. It gives some impression of what should be done to add EL9.

Thanks. That is very helpful, indeed. I updated my change following what are changed in that commit.

[ekohl]

I'd like to merge & release voxpupuli/puppet_metadata#36 first so we get CI.

[kajinamit]

Just triggering CI since now we expect CentOS9 job is enabled.

[ekohl]

Looks like they indeed run, but fail. I suspect this bit needs to be modified for the tests to pass:

puppet-epel/spec/acceptance/usage_spec.rb

Lines 55 to 59 in 93c7500

	command = if fact('os.release.major') == '8'
	'/usr/bin/yum-config-manager --dump epel'
	else
	'/usr/bin/yum-config-manager epel'
	end

Edit: and there's more there that uses incorrect conditionals where it should treat EL8 as the default.

[kajinamit]

Looks like they indeed run, but fail. I suspect this bit needs to be modified for the tests to pass:

puppet-epel/spec/acceptance/usage_spec.rb

Lines 55 to 59 in 93c7500

	command = if fact('os.release.major') == '8'
	'/usr/bin/yum-config-manager --dump epel'
	else
	'/usr/bin/yum-config-manager epel'
	end

Edit: and there's more there that uses incorrect conditionals where it should treat EL8 as the default.

I fixed these conditions to use the same command for both CentOS 8 and CentOS 9, which hopefully helps us to add support for future CentOS 10 .
Ideally we should replace yum by dnf but I think that can be done as a separate work.

[ekohl]

Thanks!