feat: ✨ Add gpg-learn-serialno command

Yubikey/gpg-learn-serialno.sh

@@ -0,0 +1,15 @@
+# Print the command to be executed
+echo "Executing command: gpg-connect-agent 'scd serialno' 'learn --force' /bye"
+
+# Check for user confirmation
+read -p "Are you sure you want to execute this command? (y/n) " -n 1 -r
+echo
+
+if [[ $REPLY =~ ^[Yy]$ ]]; then
+  # Execute the command
+  gpg-connect-agent "scd serialno" "learn --force" /bye
+else
+  # Do nothing
+  echo "Command not executed."
+fi
+