refactor: rename architecture detection function for clarity

- Changed function name from detect_arch to validate_arch in setup.apk.sh to improve code readability and maintainability.

Author: Victor Santos

scripts/setup.apk.sh

@@ -183,7 +183,7 @@ fi
 check_tool "wget"
 
 # Setup
-detect_arch
+validate_arch
 import_rsa_key
 setup_repository
 update_apk