Add Debian Bullseye with GCC 12 #152

Job	Run time
build (linux/amd64, ubuntu-24.04, bullseye, gcc, 12)	1m 50s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 13)	1m 40s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 14)	1m 47s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 15)	2m 20s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 16)	1m 46s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 20)	1m 46s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 13)	2m 11s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 19)	1m 54s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 12)	2m 13s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 17)	1m 48s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 18)	1m 51s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 16)	2m 11s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 12)	1m 49s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 20)	2m 13s
build (linux/arm64, ubuntu-24.04-arm, bullseye, gcc, 12)	2m 6s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 17)	2m 17s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 18)	2m 11s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 14)	2m 14s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 15)	2m 18s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 19)	2m 18s
merge	-1s
	40m 42s

Provide feedback