Update armhf to support ARMv6

Would you please consider lowering the armhf bar just a bit from ARMv7 to ARMv6? There are still plenty of ARMv6 devices around that still receive active support from their manufacturers. Is there a compelling reason not to bump armhf support down from v7 to v6? Anything targeted to v6 will run on v7.

Alpine upstream supports ARMv6: Docker Hub