Fix a bug and Add debug log

Author: tsuzu

cmd/dexsidecar/main.go

@@ -32,6 +32,8 @@ func main() {
 	defer cancel()
 
 	for {
+		slog.Debug("rotating token")
+
 		if err := issuer.Rotate(ctx); err != nil {
 			slog.Error("failed to rotate token", "error", err)
 		}

pkg/issuer/config.go

@@ -25,7 +25,9 @@ const envFromFileErefix = "dex_file_"
 var _ ConfigLoader = ConfigFromEnvs
 
 func ConfigFromEnvs() (Config, error) {
-	config := Config{}
+	config := Config{
+		Values: url.Values{},
+	}
 	for _, env := range os.Environ() {
 		key, value, err := loadFromFile(env)
 		if err != nil {

pkg/issuer/issuer.go

@@ -121,6 +121,7 @@ func (iss *tokenIssuer) Rotate(ctx context.Context) error {
 	if expiresAt.After(iss.now().Add(config.RefreshBefore)) {
 		return nil
 	}
+	slog.Info("token is outdating", "expires_at", expiresAt, "refresh_before", config.RefreshBefore)
 
 	token, expIn, err := iss.issue(ctx, config)
 	if err != nil {