Switch to Ubicloud runners for Alpine and Rocky Linux tests #216

Job	Run time
lint	7s
test (ubuntu-latest, ubuntu:latest, ubuntu)	32s
test (ubicloud, alpine:latest, alpine)	26s
test (ubicloud, rockylinux:9, rockylinux)	1m 13s
test (windows-latest, windows)	2m 43s
test (macos-latest, macos)	56s
Test Makeself on Solaris	4m 37s
Test Makeself on NetBSD	2m 32s
Test Makeself on OpenBSD	2m 16s
Test Makeself on FreeBSD	2m 27s
Test Makeself on Alpine	8s
Test Makeself on Nanoserver	34s
	18m 31s

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