Fix errors on loading env vars not logging anything at all

The logging stack isn't initiated at this time, so we are just plain logging to stderr

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 	"strings"
 
@@ -141,14 +142,14 @@ func loadEnvironmentVariables() {
 		return s
 	}), nil)
 	if err != nil {
-		setupLog.Error(err, "could not load environment variables")
+		_, _ = fmt.Fprintf(os.Stderr, "could not load environment variables: %v\n", err)
 	}
 
 	if err := koanfInstance.UnmarshalWithConf("", &cfg.Config, koanf.UnmarshalConf{Tag: "koanf", FlatPaths: true}); err != nil {
-		setupLog.Error(err, "could not merge defaults with settings from environment variables")
+		_, _ = fmt.Fprintf(os.Stderr, "could not merge defaults with settings from environment variables: %v\n", err)
 	}
 	if err := cfg.Config.ValidateSyntax(); err != nil {
-		setupLog.Error(err, "settings invalid")
+		_, _ = fmt.Fprintf(os.Stderr, "settings invalid: %v\n", err)
 		os.Exit(2)
 	}
 }