How can I get a fatjar?

build.gradle

import com.moowork.gradle.node.yarn.YarnTask

/*
 * This file was generated by the Gradle 'init' task.
 */

buildscript {
    repositories {
        mavenCentral()
        jcenter()
        maven {
            url "https://plugins.gradle.org/m2/"
        }
    }
    dependencies {
        classpath "gradle.plugin.com.google.cloud.tools:jib-gradle-plugin:1.6.1"
        classpath "net.ltgt.gradle:gradle-apt-plugin:0.21"
        classpath "com.moowork.gradle:gradle-node-plugin:1.3.1"
    }
}
    apply plugin: 'java'
    apply plugin: 'application'
    apply plugin: 'maven'
    apply plugin: 'maven-publish'
    apply plugin: 'com.moowork.node'


description = "agrilinkresource"
mainClassName = "com.agrilink.agrilinkresource.AgrilinkResourceServer"
archivesBaseName = "agrilinkresource"
assert System.properties["java.specification.version"] == "1.8" || "11" || "12" | "13"

ext {
    mapstructVersion = '1.3.1.Final'
    micronautVersion = '1.3.3'
    micronautKafka = '1.2.0'
    micronautSecurityJwt = '1.3.1'
    micronautTestJunit = '1.1.5'
}

dependencies {
    compile project(":agrilinkshared")
    implementation 'io.opentracing.brave:brave-opentracing:0.34.2'
    compile "org.keycloak:keycloak-admin-client:9.0.0"
    compile "org.keycloak:keycloak-core:9.0.0"
    compile "org.jboss.resteasy:resteasy-multipart-provider:3.9.3.Final"
    compile "org.jboss.resteasy:resteasy-jackson2-provider:3.9.3.Final"
    compile("io.micronaut.configuration:micronaut-security-oauth2:1.3.1")
    compile("io.micronaut:micronaut-security:1.3.1")
    compile "io.micronaut:micronaut-tracing:${micronautVersion}"
    compile "io.micronaut:micronaut-security-jwt:${micronautSecurityJwt}"
    compile "io.micronaut:micronaut-discovery-client:${micronautVersion}"
    compile "javax.annotation:javax.annotation-api:1.3.2"
    compile "io.micronaut:micronaut-http-client:${micronautVersion}"
    compile "io.micronaut:micronaut-inject:${micronautVersion}"
    compile "io.micronaut:micronaut-validation:${micronautVersion}"
    compile "io.micronaut:micronaut-runtime:${micronautVersion}"
//    compile "io.micronaut.configuration:micronaut-kafka:${micronautKafka}"
//    compile "io.micronaut.configuration:micronaut-kafka-streams:${micronautKafka}"
    compile "io.micronaut:micronaut-http-server-netty:${micronautVersion}"
    compile "org.jooq:jool:0.9.14"
    compile "net.jodah:failsafe:2.3.1"
    compile "io.projectreactor:reactor-core:3.2.11.RELEASE"
    compile "an.awesome:pipelinr:0.3"
//    runtime "io.zipkin.brave:brave-instrumentation-http:5.6.5"
//    runtime "io.zipkin.reporter2:zipkin-reporter:2.10.0"
    runtime "ch.qos.logback:logback-classic:1.2.3"
    compile "com.google.guava:guava:28.1-jre"
    testCompile "org.junit.jupiter:junit-jupiter-api:5.5.0"
    testCompile "org.junit.jupiter:junit-jupiter-engine:5.5.0"
    testCompile "io.micronaut.test:micronaut-test-junit5:${micronautTestJunit}"
    compile "org.mapstruct:mapstruct:${mapstructVersion}"
    compileOnly "org.projectlombok:lombok:1.18.8"
    annotationProcessor "org.projectlombok:lombok:1.18.8"
    compile "org.mapstruct:mapstruct:${mapstructVersion}"
    annotationProcessor "org.mapstruct:mapstruct-processor:${mapstructVersion}"
    compile "io.micronaut:micronaut-inject-java:${micronautVersion}"
    annotationProcessor "io.micronaut:micronaut-inject-java:${micronautVersion}"
    compile "io.micronaut:micronaut-validation:${micronautVersion}"
    annotationProcessor "io.micronaut:micronaut-validation:${micronautVersion}"
}


tasks.withType(JavaCompile) {
    options.encoding = 'UTF-8'
}


tasks.withType(JavaCompile) {
    options.compilerArgs = [
            '-Amapstruct.suppressGeneratorTimestamp=true'
    ]
}

tasks.register("agrilinkresource:copyReactAppToTarget")
tasks.register("agrilinkresource:copyReactAppToTargetResources")

task "copyReactAppToTarget"(type: Copy) {
    from("src/main/app")
    into("target/app-src")
}

task "bundle" (type: YarnTask) {
    dependsOn(yarn)
    setWorkingDir(file("target/app-src"))
    args = ["build"]
}


task "copyReactAppToTargetResources"(type: Copy) {
    dependsOn(bundle)
    from("target/app-src/build")
    into("target/resources/main/app")
}


yarn {
    dependsOn(copyReactAppToTarget)
}

run {
    dependsOn(copyReactAppToTargetResources)
    main = "com.agrilink.agrilinkresource.AgrilinkResourceServer"
//        args("--spring.profiles.active=demo")
}

assemble {
    dependsOn(jar)
    dependsOn(copyReactAppToTargetResources)
}


node {
    version = "12.16.1"
    yarnVersion = "1.22.4"
    download = true
    buildDir = file("target")
    distBaseUrl = "https://nodejs.org/dist"
//    yarnWorkDir = file("${project.buildDir}/yarn")
    workDir = file("$buildDir/app/nodejs")
    yarnWorkDir = file("$buildDir/app/yarn")
//    nodeModulesDir = file("${project.buildDir}/resources/main/react-app")
    nodeModulesDir = file("$buildDir/app-src")
}