[Fix] allow usage of multiple scriptengines by using shadow for the fat jar and merge service files

.github/workflows/build.yml

@@ -37,7 +37,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-
       - name: Run Gradle
-        run: ./gradlew && ./gradlew jar
+        run: ./gradlew && ./gradlew shadowJar
       - name: Upload build
         uses: actions/upload-artifact@v3
         with:

build.gradle

@@ -24,6 +24,8 @@ plugins {
     // Apply the java plugin to add support for Java
     id 'java'
 
+    id 'com.github.johnrengelman.shadow' version '8.1.1'
+
     // Apply the protobuf auto generator
     id 'com.google.protobuf' version "0.8.18"
 
@@ -129,6 +131,19 @@ application {
     getMainClass().set('emu.grasscutter.Grasscutter')
 }
 
+shadowJar {
+    exclude("*.proto")
+    zip64 = true
+    duplicatesStrategy = DuplicatesStrategy.INCLUDE
+    mergeServiceFiles()
+
+    archiveBaseName = 'grasscutter'
+    if (project.hasProperty('jarFilename')) {
+        archiveFileName = "${jarFilename}.${extension}"
+    }
+
+    destinationDirectory = file(".")
+}
 
 jar {
     exclude '*.proto'