Dockerfile only supports x86 hosts

[marcbonnici]

The Dockerfile current relies on installing the android SDK for which is x86 only, this needs updating to allow to running on non x86 hosts.

[setrofim]

We just need to find Arm binaries, specifically, for adb, aapt and fastboot (or whatever their current flavors are called). Worst case, we can build then ourselves and bundle them with devlib, removing the external dependency entirely (we'd need to check if that would introduce licensing issues, though).