Update CI Distro Matrix

[MichaelSimons]

Current CI Distro Matrix

6.0	8.0	9.0
Alpine 3.17	Alpine 3.19	Alpine 3.19
Debian 11
CentOS 7
	CentOS Stream 8
CentOS Stream 9	CentOS Stream 9	CentOS Stream 9
Fedora 38	Fedora 38	Fedora 39
Ubuntu 18.04	Ubuntu 22.04	Ubuntu 22.04

Proposed changes

6.0

• Drop Debian 11
• Upgrade Fedora 38 -> 40
• Ubuntu 18.04 -> 20.04

8.0

• Drop CentOS Stream 8
• Upgrade Fedora 38 -> 40
• Update Alpine 3.19 -> 3.20
• Add Alma Linux 8

9.0

• Upgrade Fedora 39 -> 40
• Ubuntu 22.04 -> 24.04
• Update Alpine 3.19 -> 3.20
• Add Alma Linux 8

Proposed CI Distro Matrix

6.0	8.0	9.0
Alpine 3.17	Alpine 3.20	Alpine 3.20
	Alma Linux 8	Alma Linux 8
CentOS 7
CentOS Stream 9	CentOS Stream 9	CentOS Stream 9
Fedora 40	Fedora 40	Fedora 40
Ubuntu 20.04	Ubuntu 22.04	Ubuntu 24.04

[omajid]

Would it be possible to add a CentOS 8-like OS (Alma? Rocky?) to the matrix for 8.0 and/or 9.0?

[MichaelSimons]

[Triage] The point of @omajid's suggestion is to ensure SB builds on the lowest supported glibc version.

[MichaelSimons]

[Triage] We should ensure this proposal aligns with the CI policy and resolve any differences (either way).