Add step to check if image already exists #180

Job	Run time
build (linux/amd64, ubuntu-24.04, bullseye, gcc, 12)	1h 32m 18s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 20)	1m 57s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 15)	1m 57s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 13)	1m 54s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 14)	1m 55s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 16)	2m 3s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 16)	1m 56s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 13)	2m 14s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 19)	2m 2s
build (linux/arm64, ubuntu-24.04-arm, bullseye, gcc, 12)	59m 41s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 15)	2m 38s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 14)	2m 3s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 12)	1m 49s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 17)	2m 2s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 19)	2m 0s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 18)	2m 14s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 18)	1m 48s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 12)	2m 1s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 17)	2m 9s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 20)	2m 7s
merge	0s
	3h 8m 48s

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