Ensure CoinGecko API key is set

Author: fafk

crates/shared/src/price_estimation/factory.rs

@@ -226,6 +226,11 @@ impl<'a> PriceEstimatorFactory<'a> {
                 ))
             }
             NativePriceEstimatorSource::CoinGecko => {
+                anyhow::ensure!(
+                    self.args.coin_gecko.coin_gecko_api_key.is_some(),
+                    "coin_gecko_api_key must be set when CoinGecko is used as a native price estimator"
+                );
+
                 let name = "CoinGecko".to_string();
                 let coin_gecko = native::CoinGecko::new(
                     self.components.http_factory.create(),