Update ci matrix and .NET installation instructions. #648

Job	Run time
Verify tests pass (docker.io/library/alpine:latest, 8.0)	1m 1s
Verify tests pass (docker.io/library/alpine:edge, 8.0)	1m 0s
Verify tests pass (quay.io/centos/centos:stream9, 8.0)	1m 0s
Verify tests pass (quay.io/centos/centos:stream9, 9.0)	1m 0s
Verify tests pass (quay.io/centos/centos:stream10, 8.0)	1m 0s
Verify tests pass (quay.io/centos/centos:stream10, 9.0)	1m 1s
Verify tests pass (registry.fedoraproject.org/fedora:40, 8.0)	59s
Verify tests pass (registry.fedoraproject.org/fedora:40, 9.0)	1m 1s
Verify tests pass (registry.fedoraproject.org/fedora:41, 8.0)	58s
Verify tests pass (registry.fedoraproject.org/fedora:41, 9.0)	1m 0s
Verify tests pass (registry.fedoraproject.org/fedora:rawhide, 8.0)	1m 0s
Verify tests pass (registry.fedoraproject.org/fedora:rawhide, 9.0)	59s
Verify tests pass (registry.access.redhat.com/ubi8, 8.0)	1m 1s
Verify tests pass (registry.access.redhat.com/ubi8, 9.0)	1m 3s
Verify tests pass (registry.access.redhat.com/ubi9, 8.0)	1m 0s
Verify tests pass (registry.access.redhat.com/ubi9, 9.0)	18s
	15m 21s

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