Reduce size by using base images #137

Job	Run time
vars	2s
ink-cross-step0	5m 5s
ink-cross-step1	9m 6s
ink-cross-step2-clang	19m 41s
ink-cross (aarch64-unknown-linux-gnu, linux/amd64,linux/arm64)	32m 33s
ink-cross (armv7-unknown-linux-gnueabihf, linux/amd64,linux/arm64)	32m 10s
ink-cross (native, linux/amd64,linux/arm64)	29m 49s
ink-cross (powerpc64-unknown-linux-gnu, linux/amd64)	8m 28s
ink-cross (powerpc64le-unknown-linux-gnu, linux/amd64,linux/arm64)	32m 38s
ink-cross (riscv64gc-unknown-linux-gnu, linux/amd64,linux/arm64)	30m 28s
ink-cross (s390x-unknown-linux-gnu, linux/amd64,linux/arm64)	33m 27s
ink-cross (sparc64-unknown-linux-gnu, linux/amd64)	5m 38s
ink-cross (x86_64-unknown-linux-gnu, linux/amd64,linux/arm64)	32m 47s
ink-cross-clang (aarch64-unknown-freebsd, linux/amd64,linux/arm64, true)	32m 20s
ink-cross-clang (aarch64-unknown-linux-musl, linux/amd64,linux/arm64)	33m 46s
ink-cross-clang (armv7-unknown-linux-musleabihf, linux/amd64,linux/arm64)	32m 40s
ink-cross-clang (x86_64-unknown-freebsd, linux/amd64,linux/arm64)	37m 32s
ink-cross-clang (x86_64-unknown-linux-musl, linux/amd64,linux/arm64)	33m 13s
ink-cross-clang (x86_64-unknown-netbsd, linux/amd64,linux/arm64)	37m 34s
ink-cross-clang (x86_64-unknown-openbsd, linux/amd64,linux/arm64, true)	28m 47s
	8h 27m 44s

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