x86_64 to latest Alpine

The arm images is switched to multiarch since the hypriot image hasn't been updated in 3 years:
https://hub.docker.com/r/hypriot/rpi-alpine/tags

Currently the multiarch release of Alpine 3.11 is hold back by QEMU issues, see:
multiarch/alpine#28 but the update to 3.10 is a huge leap and 3.10 is still under support :)
Signed-off-by: kmova <kiran.mova@mayadata.io>
(cherry picked from commit 528d2e2a03f02a9ba4f99d8df83c83fc808cd2e6)