ld: dockerfile enhancements #257

Job	Run time
binutils-targets	7s
utils-lipo	1m 30s
ld64	20s
utils-sigtool	2m 6s
ld-targets	5s
binutils (binutils-linux-386-alpine)	18m 51s
binutils (binutils-linux-amd64-alpine)	18m 38s
binutils (binutils-linux-arm64-alpine)	18m 44s
binutils (binutils-linux-armv6-alpine)	18m 15s
binutils (binutils-linux-armv7-alpine)	18m 27s
binutils (binutils-linux-ppc64le-alpine)	18m 43s
binutils (binutils-linux-riscv64-alpine)	10m 30s
ld (ld-linux-386-static-tgz)	9s
ld (ld-linux-amd64-static-tgz)	9s
ld (ld-linux-arm64-static-tgz)	14s
binutils (binutils-linux-s390x-alpine)	18m 8s
ld (ld-linux-armv6-static-tgz)	11s
binutils (binutils-windows-386-alpine)	11m 1s
ld (ld-linux-armv7-static-tgz)	12s
binutils (binutils-windows-amd64-alpine)	10m 56s
ld (ld-linux-ppc64le-static-tgz)	9s
ld (ld-linux-riscv64-static-tgz)	12s
ld (ld-linux-s390x-static-tgz)	10s
ld (ld-windows-386-static-tgz)	8s
ld (ld-windows-amd64-static-tgz)	14s
release	0s
	2h 48m 9s

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