Add Node debian core variant #20

Job	Run time
generate-matrix	5s
build (18.20.1, alpine3.18)	19s
build (18.20.1, alpine3.19)	18s
build (18.20.1, bookworm)	31s
build (18.20.1, bookworm-core, bookworm-slim)	42s
build (18.20.1, bookworm-slim)	47s
build (18.20.1, bullseye)	37s
build (18.20.1, bullseye-core, bullseye-slim)	42s
build (18.20.1, bullseye-slim)	39s
build (18.20.1, buster)	47s
build (18.20.1, buster-core, buster-slim)	44s
build (18.20.1, buster-slim)	41s
build (20.12.1, alpine3.18)	19s
build (20.12.1, alpine3.19)	18s
build (20.12.1, bookworm)	35s
build (20.12.1, bookworm-core, bookworm-slim)	40s
build (20.12.1, bookworm-slim)	41s
build (20.12.1, bullseye)	44s
build (20.12.1, bullseye-core, bullseye-slim)	48s
build (20.12.1, bullseye-slim)	40s
build (20.12.1, buster)	42s
build (20.12.1, buster-core, buster-slim)	44s
build (20.12.1, buster-slim)	1m 9s
build (21.7.2, alpine3.18)	16s
build (21.7.2, alpine3.19)	24s
build (21.7.2, bookworm)	43s
build (21.7.2, bookworm-core, bookworm-slim)	40s
build (21.7.2, bookworm-slim)	1m 20s
build (21.7.2, bullseye)	1m 8s
build (21.7.2, bullseye-core, bullseye-slim)	38s
build (21.7.2, bullseye-slim)	39s
	20m 0s

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