We are switching from alpine to debian due to a network issue
introduced in alpine 3.13+ which fails to verify certificates
due to not all armhf boards meet the time64 requirement:
https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.13.0\#time64_requirements
Also, Debian does not have official imagess for arm32v6 architecture
so we are building with arm32v5 arch in the Makefile.
Change-Id: I3660c3f64b7c2b342dd4ccb876af5f4e3036ea9d