Remove armv6 builds as they not supported by Ubuntu

Author: TimJDFletcher

samba-timemachine/run

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -eu -o pipefail
 IMAGE_NAME=samba-timemachine
-PLATFORMS="linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7"
+PLATFORMS="linux/amd64,linux/arm64,linux/arm/v7"
 
 build () {
     docker build "${@}" -t "${IMAGE_NAME}:tmp" -f Dockerfile .