gradle docker image build task

build.gradle

task docker(dependsOn: tasks.bootJar) {
	def tag = 'app'
	def workDir = file("$buildDir/docker")
	def dockerFile = file('src/main/docker/Dockerfile')
	def inputDir = file("$buildDir/libs")

	doLast {
		copy {
			from inputDir
			from dockerFile
			into workDir
		}

		exec {
			workingDir workDir
			commandLine 'docker', 'build', '--pull', '-t', tag, '.'
		}
	}
}