Add patched Godot and SDL for Focal
This MR
- adds a patched version of Godot and SDL to the images, so that app's can easily ship them
- upgrades the default Rust version to latest 1.72.1
- makes
arm64
the default cross build target in the image build script - increments the image version, so that Clickable can require the change
contributes to clickable#410 (closed)
Edited by Jonatan Hatakeyama Zeidler