Force use of local gcc image for base #158

Job	Run time
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 12)	1m 42s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 14)	1m 46s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 16)	1m 56s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 15)	1m 50s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 20)	1m 44s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 12)	2m 3s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 18)	2m 6s
build (linux/amd64, ubuntu-24.04, bullseye, gcc, 12)	58m 24s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 19)	1m 47s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 17)	1m 47s
build (linux/arm64, ubuntu-24.04-arm, bullseye, gcc, 12)	58m 5s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 14)	2m 7s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 13)	1m 53s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 13)	2m 33s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 16)	2m 13s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 19)	2m 16s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 15)	2m 11s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 17)	2m 1s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 18)	2m 9s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 20)	2m 8s
merge	0s
	2h 32m 41s

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