Build and run examples in CI

[ayrtonm]

This will make it less likely for the examples to get out of sync with the psx crate. Now that the BIOS #13 kinda works, running the examples that work with mednafen is also an option. xvfb should have a way to get screenshots so it might even be possible to check the programs that don't write to stdout.

• bios
  • built in CI and used to run psx crate tests
• stdout
  • build, run and compare stdout
• hello_world
  • build and compare with screenshot
• fs
  • need to check if duckstation can run in xvfb and build mkpsxiso in CI
• ferris
  • build, could run but comparing with screenshot would be difficult
• donut
  • build, could run but comparing with screenshot would be difficult
• monkey
  • build, could run but comparing with screenshot would be difficult
• loader
  • need to check if duckstation can run in xvfb and build mkpsxiso in CI
  • build.rs changes directories which might cause issues with xvfb

Also an alternative to building mkpsxiso is to finish the WIP adding ISO support to cargo-psx that's on the cargo-psx-iso branch (or at least get it to the point where it builds an ISO that can be loaded).

[ayrtonm]

#26 builds all examples in CI, but they aren't run/tested yet.