Hi i'm trying to include a built react app into my jar using gradle, i have a multiproject setup :

plugins {
    id 'java'
    id 'com.github.johnrengelman.shadow' version '7.1.2'
    id 'maven-publish'
    id 'org.ajoberstar.grgit' version '5.2.2'
    id 'fabric-loom' version "$fabric_loom_version" apply false
    id "com.github.node-gradle.node" version "7.0.2"
}

group = 'net.vitacraft'
archivesBaseName = 'DiscordBotManager'
version = "1.0"
description = "$ext.plugin_description"

java {
    toolchain.languageVersion = JavaLanguageVersion.of(21)
}

repositories {
    mavenCentral()
    maven { url '<https://maven.fabricmc.net/>' }
    maven { url '<https://libraries.minecraft.net/>' }
    maven { url '<https://api.modrinth.com/maven>' }
    maven { url '<https://repo.papermc.io/repository/maven-public/>' }
    maven { url '<https://hub.spigotmc.org/nexus/content/repositories/snapshots/>' }
    maven { url '<https://repo.spongepowered.org/repository/maven-public/>' }
    maven { url '<https://jitpack.io>' }
}

dependencies {
    implementation project(':common')
    implementation project(':bukkit')
    implementation project(':fabric')
    implementation project(':velocity')
    implementation project(':waterfall')
    implementation project(':paper')
    implementation project(':webui')

    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.10.2'
    testImplementation 'org.junit.jupiter:junit-jupiter-params:5.10.2'
    testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.10.2'

    compileOnly 'com.mojang:brigadier:1.0.18'
    compileOnly "io.papermc.paper:paper-api:1.21-R0.1-SNAPSHOT"

    implementation("com.github.Carleslc.Simple-YAML:Simple-Yaml:1.8.4")
    shadow 'com.github.Carleslc.Simple-YAML:Simple-Yaml:1.8.4'

    implementation("net.dv8tion:JDA:5.0.1")
    implementation files("${project.projectDir}/libs/JDA-5.0.1-withDependencies-min.jar")

    implementation files("${project.projectDir}/libs/jmjda-1.2.1.jar")
}

processResources {
    filesMatching(['fabric.mod.json', 'plugin.yml', '<http://mcmod.info|mcmod.info>', 'META-INF/mods.toml', 'pack.mcmeta']) {
        expand project.properties
    }
}

shadowJar {
    archiveClassifier.set('')
    dependencies {
        exclude("META-INF/versions/**")
        include(dependency('com.github.Carleslc.Simple-YAML:Simple-Yaml:1.8.4'))
        include(dependency("${project.group}:common"))
        include(project(':common'))
        include(project(':bukkit'))
        include(project(':fabric'))
        include(project(':velocity'))
        include(project(':waterfall'))
        include(project(':paper'))
        include(':webui')
    }
}

jar {
    finalizedBy shadowJar
}

subprojects {
    apply plugin: 'java'
    apply plugin: 'maven-publish'
    apply plugin: 'com.github.johnrengelman.shadow'

    java {
        toolchain.languageVersion = JavaLanguageVersion.of(21)
    }

    repositories {
        mavenCentral()
        maven { url "<https://libraries.minecraft.net>" }
        maven { url '<https://jitpack.io>' }
    }

    dependencies {
        if (project.name != 'common') {
            implementation project(':common')
        }
        compileOnly 'org.jetbrains:annotations:24.1.0'
        compileOnly 'org.projectlombok:lombok:1.18.32'

        annotationProcessor 'org.projectlombok:lombok:1.18.32'

        testImplementation 'org.junit.jupiter:junit-jupiter-api:5.10.2'
        testImplementation 'org.junit.jupiter:junit-jupiter-params:5.10.2'
        testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.10.2'

        compileOnly 'com.mojang:brigadier:1.0.18'

        shadow implementation("com.github.Carleslc.Simple-YAML:Simple-Yaml:1.8.4")

        implementation("net.dv8tion:JDA:5.0.1")
        implementation files("${project.projectDir}/libs/JDA-5.0.1-withDependencies-min.jar")

        implementation files("${project.projectDir}/libs/jmjda-1.2.1.jar")
    }

    processResources {
        filesMatching(['fabric.mod.json', 'plugin.yml', '<http://mcmod.info|mcmod.info>', 'META-INF/mods.toml', 'pack.mcmeta']) {
            expand project.properties
        }
    }

    shadowJar {
        archiveClassifier.set('')
    }
}

logger.lifecycle("Building ${project.name} ${version} by VitacraftOrg")

and my webui is built with this webui/build.gradle file

plugins {
    id 'com.github.node-gradle.node' version '7.0.2'
}

node {
    version = '14.17.0'
    npmVersion = '6.14.13'
    download = true
}

task npmBuild(type: NpmTask) {
    dependsOn npmInstall
    mustRunAfter jar
    args = ['run', 'build']
    inputs.files fileTree('src')
    inputs.files fileTree('public')
    inputs.file 'package.json'
    inputs.file 'package-lock.json'
    outputs.dir 'build'
}

clean {
    delete 'build'
}

assemble.dependsOn npmBuild

issue is, after running

./gradlew clean build

everything is built correctly but inspecting the output jar i cannot seem to find the "build" folder with the react assets, what am i doing wrong ?