The issue here is not adding curl as build-package for assets part in snapcraft.yaml.
But yes, you are right that the codes don't change unless a new country is created/destroyed (every 3 months or so that a new war begins :P).
That first stage of downloading codes can be executed manually and store results in a file used in compilation time.
Let me change it and populate README.md with steps to execute it
The issue here is not adding curl as build-package for assets part in snapcraft.yaml.
But yes, you are right that the codes don't change unless a new country is created/destroyed (every 3 months or so that a new war begins :P).
That first stage of downloading codes can be executed manually and store results in a file used in compilation time.
Let me change it and populate README.md with steps to execute it