Reduce size by using base images #135

Job	Run time
vars	2s
ink-cross-step0	5m 11s
ink-cross-step1	9m 17s
ink-cross-step2-clang	22m 9s
ink-cross (aarch64-unknown-linux-gnu, linux/amd64,linux/arm64)	31m 7s
ink-cross (armv7-unknown-linux-gnueabihf, linux/amd64,linux/arm64)	32m 18s
ink-cross (powerpc64-unknown-linux-gnu, linux/amd64)	5m 36s
ink-cross (powerpc64le-unknown-linux-gnu, linux/amd64,linux/arm64)	34m 28s
ink-cross (riscv64gc-unknown-linux-gnu, linux/amd64,linux/arm64)	31m 8s
ink-cross (s390x-unknown-linux-gnu, linux/amd64,linux/arm64)	34m 58s
ink-cross (sparc64-unknown-linux-gnu, linux/amd64)	6m 13s
ink-cross (x86_64-unknown-linux-gnu, linux/amd64,linux/arm64)	35m 7s
ink-cross-clang (aarch64-unknown-freebsd, linux/amd64,linux/arm64, true)	30m 18s
ink-cross-clang (aarch64-unknown-linux-musl, linux/amd64,linux/arm64)	33m 12s
ink-cross-clang (armv7-unknown-linux-musleabihf, linux/amd64,linux/arm64)	32m 35s
ink-cross-clang (x86_64-unknown-freebsd, linux/amd64,linux/arm64)	38m 13s
ink-cross-clang (x86_64-unknown-linux-musl, linux/amd64,linux/arm64)	35m 17s
ink-cross-clang (x86_64-unknown-netbsd, linux/amd64,linux/arm64)	36m 3s
ink-cross-clang (x86_64-unknown-openbsd, linux/amd64,linux/arm64, true)	29m 22s
	8h 2m 34s

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