more flexible ondemand.d configurations. (#258) #378

Job	Run time
package-tests (centos/centos:stream8, default)	7m 28s
package-tests (centos/centos:stream8, upgrade)	4m 13s
package-tests (rockylinux:8, default)	7m 45s
package-tests (rockylinux:8, upgrade)	4m 1s
package-tests (rockylinux:9, default)	6m 54s
package-tests (rockylinux:9, upgrade)	4m 6s
package-tests (almalinux:8, default)	6m 43s
package-tests (almalinux:8, upgrade)	3m 54s
package-tests (almalinux:9, default)	5m 34s
package-tests (almalinux:9, upgrade)	3m 0s
package-tests (ubuntu:20.04, default)	6m 32s
package-tests (ubuntu:20.04, upgrade)	3m 56s
package-tests (ubuntu:22.04, default)	6m 27s
package-tests (ubuntu:22.04, upgrade)	3m 37s
	1h 14m 10s

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