fix: copy CNI plugins to /opt #1646

Job	Run time
build-lumina (39, silverblue)	11m 48s
build-lumina-nvidia (39, silverblue, open)	11m 55s
build-lumina (39, kinoite)	10m 53s
build-lumina-nvidia (39, silverblue, proprietary)	14m 9s
build-lumina (40, silverblue)	9m 25s
build-lumina-nvidia (39, kinoite, open)	13m 9s
build-lumina-nvidia (39, kinoite, proprietary)	13m 44s
build-lumina (40, kinoite)	11m 17s
build-lumina-nvidia (40, silverblue, open)	16m 41s
build-lumina (40, cosmic)	11m 7s
build-lumina-nvidia (40, silverblue, proprietary)	11m 26s
build-lumina (stable, silverblue)	16m 40s
build-lumina-nvidia (40, kinoite, open)	10m 51s
build-lumina (stable, kinoite)	12m 56s
build-lumina-nvidia (40, kinoite, proprietary)	11m 38s
build-lumina (stable, cosmic)	14m 15s
build-lumina-nvidia (40, cosmic, open)	11m 14s
build-lumina-nvidia (40, cosmic, proprietary)	10m 31s
build-lumina-nvidia (stable, silverblue, open)	13m 5s
build-lumina-nvidia (stable, silverblue, proprietary)	13m 8s
build-lumina-nvidia (stable, kinoite, open)	13m 37s
build-lumina-nvidia (stable, kinoite, proprietary)	13m 49s
build-lumina-nvidia (stable, cosmic, open)	6m 43s
build-lumina-nvidia (stable, cosmic, proprietary)	12m 31s
check	2s
	4h 56m 34s

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