Update config from env

config/config.go

@@ -43,6 +43,7 @@ func FromReader(r io.Reader) (*Config, error) {
 	if err := decoder.Decode(&c); err != nil {
 		return nil, fmt.Errorf("error parsing config file: %w", err)
 	}
+	c.UpdateFromEnv()
 
 	return &c, c.Verify()
 }

config/config_test.go

@@ -98,6 +98,12 @@ func TestConfig(t *testing.T) {
 		if c.LogLevel != envValues["DOGTAMER_LOGLEVEL"] {
 			t.Errorf("LogLevel has wrong value: %s", c.LogLevel)
 		}
+
+		t.Cleanup(func() {
+			for value := range envValues {
+				os.Unsetenv(value)
+			}
+		})
 	})
 	t.Run("TestFromEnvInvalid", func(t *testing.T) {
 		os.Clearenv()