feat(proxy): add proxy from env variables

main.go

@@ -122,7 +122,13 @@ func main() {
 
 	agg := NewAggregator()
 
-	client := &http.Client{Timeout: 15 * time.Second}
+	transport := &http.Transport{
+		Proxy: http.ProxyFromEnvironment,
+	}
+	client := &http.Client{
+		Timeout:   15 * time.Second,
+		Transport: transport,
+	}
 
 	for _, source := range cfg.Sources {
 		cached, err := loadCachedLinks(cfg.CacheDir, source)