docs(rock3): add ROCK 3B Debian 12 Bookworm KDE R1 system image #3435

Job	Run time
test-optional (gitown, manual)	40s
test-optional (check-external-links, manual)	1m 4s
test (push)	48s
test (commit)	47s
build	0s
deploy	0s
	3m 19s

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