buildscript {
    ext {
        springBootVersion = '1.5.15.RELEASE'
        kotlinVersion = '1.2.70'
        queryDslVersion = '4.1.4'
        env = 'local'
    }
    // ...
}

spring.profiles.active=local

task setEnv {
    doFirst {
        ant.propertyfile(file: "$projectDir/src/main/resources/application.properties") {
            entry( key: "spring.profiles.active", value: "$env")
        }
        println "Building with env = $env"
    }
}

#Fri, 14 Dec 2018 11:22:04 -0200
spring.profiles.active=local