Heroku for Grails 5 - heroku

Question

I am trying to setup my grails 5 application with Heroku. This is my first time to setup a fullstack application and I am struggeling hard, because I can't really find some good tutorials/documentations for grails 5.
My build gradle looks like this:
buildscript {
repositories {
maven { url "https://repo.grails.org/grails/core" }
}
dependencies {
classpath "org.grails:grails-gradle-plugin:$grailsGradlePluginVersion"
classpath "org.grails.plugins:hibernate5:7.2.2"
classpath "gradle.plugin.com.github.erdi.webdriver-binaries:webdriver-binaries-gradle-plugin:2.6"
classpath "com.bertramlabs.plugins:asset-pipeline-gradle:3.3.4"
}
}
version "0.1"
group "grails.website"
apply plugin:"eclipse"
apply plugin:"idea"
apply plugin:"war"
apply plugin:"org.grails.grails-web"
apply plugin:"com.github.erdi.webdriver-binaries"
apply plugin:"com.bertramlabs.asset-pipeline"
apply plugin:"org.grails.grails-gsp"
repositories {
maven { url "https://repo.grails.org/grails/core" }
}
configurations {
developmentOnly
runtimeClasspath {
extendsFrom developmentOnly
}
}
dependencies {
developmentOnly("org.springframework.boot:spring-boot-devtools")
compileOnly "io.micronaut:micronaut-inject-groovy"
console "org.grails:grails-console"
implementation 'com.github.jsimone:webapp-runner:9.0.27.1'
implementation "org.springframework.boot:spring-boot-starter-logging"
implementation "org.springframework.boot:spring-boot-starter-validation"
implementation "org.springframework.boot:spring-boot-autoconfigure"
implementation "org.grails:grails-core"
implementation "org.springframework.boot:spring-boot-starter-actuator"
implementation "org.springframework.boot:spring-boot-starter-tomcat"
implementation "org.grails:grails-web-boot"
implementation "org.grails:grails-logging"
implementation "org.grails:grails-plugin-rest"
implementation "org.grails:grails-plugin-databinding"
implementation "org.grails:grails-plugin-i18n"
implementation "org.grails:grails-plugin-services"
implementation "org.grails:grails-plugin-url-mappings"
implementation "org.grails:grails-plugin-interceptors"
implementation "org.grails.plugins:cache"
implementation "org.grails.plugins:async"
implementation "org.grails.plugins:scaffolding"
implementation "org.grails.plugins:hibernate5"
implementation "org.hibernate:hibernate-core:5.6.5.Final"
implementation "org.grails.plugins:events"
implementation "org.grails.plugins:gsp"
implementation 'mysql:mysql-connector-java:8.0.28'
profile "org.grails.profiles:web"
runtimeOnly "org.glassfish.web:el-impl:2.2.1-b05"
runtimeOnly "com.h2database:h2"
runtimeOnly "org.apache.tomcat:tomcat-jdbc"
runtimeOnly "javax.xml.bind:jaxb-api:2.3.1"
runtimeOnly "com.bertramlabs.plugins:asset-pipeline-grails:3.3.4"
runtimeOnly 'mysql:mysql-connector-java:5.1.29'
testImplementation "io.micronaut:micronaut-inject-groovy"
testImplementation "org.grails:grails-gorm-testing-support"
testImplementation "org.mockito:mockito-core"
testImplementation "org.grails:grails-web-testing-support"
testImplementation "org.grails.plugins:geb"
testImplementation "org.seleniumhq.selenium:selenium-remote-driver:4.0.0"
testImplementation "org.seleniumhq.selenium:selenium-api:4.0.0"
testImplementation "org.seleniumhq.selenium:selenium-support:4.0.0"
testRuntimeOnly "org.seleniumhq.selenium:selenium-chrome-driver:4.0.0"
testRuntimeOnly "org.seleniumhq.selenium:selenium-firefox-driver:4.0.0"
}
bootRun {
ignoreExitValue true
jvmArgs(
'-Dspring.output.ansi.enabled=always',
'-noverify',
'-XX:TieredStopAtLevel=1',
'-Xmx1024m')
sourceResources sourceSets.main
String springProfilesActive = 'spring.profiles.active'
systemProperty springProfilesActive, System.getProperty(springProfilesActive)
}
tasks.withType(GroovyCompile) {
configure(groovyOptions) {
forkOptions.jvmArgs = ['-Xmx1024m']
}
}
tasks.withType(Test) {
useJUnitPlatform()
}
webdriverBinaries {
if (!System.getenv().containsKey('GITHUB_ACTIONS')) {
chromedriver {
version = '2.45.0'
fallbackTo32Bit = true
}
geckodriver '0.30.0'
}
}
tasks.withType(Test) {
systemProperty "geb.env", System.getProperty('geb.env')
systemProperty "geb.build.reportsDir", reporting.file("geb/integrationTest")
if (!System.getenv().containsKey('GITHUB_ACTIONS')) {
systemProperty 'webdriver.chrome.driver', System.getProperty('webdriver.chrome.driver')
systemProperty 'webdriver.gecko.driver', System.getProperty('webdriver.gecko.driver')
} else {
systemProperty 'webdriver.chrome.driver', "${System.getenv('CHROMEWEBDRIVER')}/chromedriver"
systemProperty 'webdriver.gecko.driver', "${System.getenv('GECKOWEBDRIVER')}/geckodriver"
}
}
assets {
minifyJs = true
minifyCss = true
}
task stage() {
dependsOn clean, war
}
tasks.stage.doLast() {
delete fileTree(dir: "build/distributions")
delete fileTree(dir: "build/assetCompile")
delete fileTree(dir: "build/distributions")
delete fileTree(dir: "build/libs", exclude: "*.war")
}
war.mustRunAfter clean
task copyToLib(type: Copy) {
into "$buildDir/server"
from(configurations.implementation) {
include "webapp-runner*"
}
}
stage.dependsOn(copyToLib)
And my Procfile like this:
web: cd build ; java $JAVA_OPTS -Xmx256m -Dgrails.env=prod -jar ../build/server/webapp-runner-*.jar --expand-war --port $PORT libs/*.war
Thanks for the help in advance!