Update ci matrix and .NET installation instructions. #647

Job	Run time
Verify tests pass (docker.io/library/alpine:latest, 8.0)	1m 31s
Verify tests pass (docker.io/library/alpine:edge, 8.0)	1m 31s
Verify tests pass (quay.io/centos/centos:stream9, 8.0)	1m 30s
Verify tests pass (quay.io/centos/centos:stream9, 9.0)	1m 31s
Verify tests pass (quay.io/centos/centos:stream10, 8.0)	1m 31s
Verify tests pass (quay.io/centos/centos:stream10, 9.0)	1m 29s
Verify tests pass (registry.fedoraproject.org/fedora:40, 8.0)	1m 29s
Verify tests pass (registry.fedoraproject.org/fedora:40, 9.0)	1m 29s
Verify tests pass (registry.fedoraproject.org/fedora:41, 8.0)	1m 29s
Verify tests pass (registry.fedoraproject.org/fedora:41, 9.0)	1m 30s
Verify tests pass (registry.fedoraproject.org/fedora:rawhide, 8.0)	1m 31s
Verify tests pass (registry.fedoraproject.org/fedora:rawhide, 9.0)	1m 30s
Verify tests pass (registry.access.redhat.com/ubi8, 8.0)	1m 30s
Verify tests pass (registry.access.redhat.com/ubi8, 9.0)	1m 31s
Verify tests pass (registry.access.redhat.com/ubi9, 8.0)	1m 26s
Verify tests pass (registry.access.redhat.com/ubi9, 9.0)	17s
	22m 45s

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