Creating debug/release apk via gradle (mainTemplate.gradle) using Jenkins

Hi

I have automate the apk build process via shell scripts as,

# "deploy.sh"
echo "Starting build process...................."
'/C/Program Files/Unity/Editor/Unity.exe' -quit -batchmode -executeMethod MyEditorScript.PerformBuild -nographics -projectPath "./SimpleMobilePlaceholder"
echo "Ending build process...................."

I have Jenkins installed with unity3d plugin and doing the above 'deply.sh' tasks via Jenkins, results in an apk generation.
Now i want to select debug or release builds via jenkins. If i add buildTypes portions in the file mainTemplate.gradle, how can i select it via Jenkins.Do i need to modify or add some script in Unity (like deploy.sh etc) ?
Please guide me how do i achieve this.

Thanks,
Saqib