Fix hanami app on M1/M2 machines

[tombruijn]

Processmon can compile on these machines, but it fails to run on the app container.

hanami2-postgres-app-1       | Starting processmon 0.4.1
hanami2-postgres-app-1       | thread 'main' panicked at 'Error running monitor: No such file or directory (os error 2)', /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/processmon-0.4.1/src/main.rs:63:19
hanami2-postgres-app-1       | note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

To do

• Check if specifying the platform for the container image helps
• Find another way to run it. Confirm that other apps do work on M1/M2 machines.