Build and include React app in spring boot application (Gradle)

build.gradle

task buildFrontend(type: Exec){
    workingDir './frontend'
    if (System.getProperty('os.name').toLowerCase(Locale.ROOT).contains('windows')) {
        commandLine('cmd', '/c', 'npm install')
        commandLine('cmd', '/c', 'npm run build')
    }
    else {
        commandLine('sh', '-c', 'npm install')
        commandLine('sh', '-c', 'npm run build')
    }
}

// Generate bundle
processResources.dependsOn(buildFrontend)

// Copy static resources from frontend in the processResource task
processResources {
    from ('frontend/build') {
        into 'static'
    }
}