Create different keystore for different flavour in Gradle Android

My current Android projects has a lot of flavors, and each flavor has different keystore to sign with. As a result it has very long build.gradle project file. As each flavor need defining separate singningConfig and defining flavor signing on release buildType. After reading couple of articles, i end up with this solution:

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1. Modify signingConfigs to fit with difference signing keystore for each flavour like example below

 
   // create 2 or more difference keystore.
    signingConfigs {
        
        configFirst {
            keyAlias KEY_ALIAS_MY
            keyPassword STORE_PASSWORD_MY
            storeFile file('../keystore_my.jks')
            storePassword KEY_PASSWORD_MY
        }

        configSecond {
            keyAlias KEY_ALIAS_SG
            keyPassword STORE_PASSWORD_SG
            storeFile file('../keystore_sg.jks')
            storePassword KEY_PASSWORD_SG
        }

        .....

        debug{

        }
    }
     

2. This is example of flavour. based on this example, only SGPROD and MYPROD i assign it to their own keystore. That's all as easy 123.. :D

    
    productFlavors{

        SGPROD{
            applicationId "com.mobile.sg"
            buildConfigField 'String', 'URL_LINK',SG_URL_PROD;
            buildConfigField 'String', 'URL_API',SG_API_PROD;
            
            //assign this flavour with signingConfigs configSecond
            signingConfig signingConfigs.configSecond
        }


        SGDEV{
            applicationId "com.mobile.sg.dev"
            buildConfigField 'String', 'URL_LINK',SG_URL_DEBUG;
            buildConfigField 'String', 'URL_API',SG_API_DEBUG;
        }

        MYPROD{
            applicationId "com.mobile.my"
            buildConfigField 'String', 'URL_LINK',MY_URL_PROD;
            buildConfigField 'String', 'URL_API',MY_API_PROD;

            //assign this flavour with signingConfigs configFirst
            signingConfig signingConfigs.configFirst
        }

        MYDEV{
            applicationId "com.mobile.my.dev"
            buildConfigField 'String', 'URL_LINK',MY_URL_DEBUG;
            buildConfigField 'String', 'URL_API',MY_API_DEBUG;
        }
    }