feat: add cli flags

cli/utils.go

@@ -0,0 +1,25 @@
+package cli
+
+import (
+	"os"
+	"strconv"
+)
+
+func getEnvString(env string, def string) string {
+	value := os.Getenv(env)
+
+	if value != "" {
+		return value
+	} else {
+		return def
+	}
+}
+
+func getEnvInt(env string, def string) int {
+	value := getEnvString(env, def)
+
+	// TODO: handle error
+	converted, _ := strconv.Atoi(value)
+
+	return converted
+}