spring-boot/spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/gradle/packaging/boot-build-image-env.gradle

plugins {
	id 'java'
	id 'org.springframework.boot' version '{gradle-project-version}'
}

// tag::env[]
tasks.named("bootBuildImage") {
	environment["BP_JVM_VERSION"] = "17"
}
// end::env[]

tasks.register("bootBuildImageEnvironment") {
	doFirst {
		bootBuildImage.environment.get().each { name, value -> println "$name=$value" }
	}
}