feat(barcode): Baseline for barcode caching

models/config.go

@@ -15,4 +15,5 @@ type Config struct {
 	SponsoringBarcodePrefix  string `mapstructure:"SPONSORING_BARCODEPREFIX"`
 	CertificateFooter        string `mapstructure:"CERTIFICATE_FOOTER"`
 	GotenbergBaseUrl         string `mapstructure:"GOTENBERG_BASEURL"`
+	RedisAddr                string `mapstructure:"REDIS_ADDR"`
 }