build: move JDK configuration for desktop app to Conveyor configuration

.github/workflows/release.yml

@@ -90,13 +90,6 @@ jobs:
           cache: 'npm'
           cache-dependency-path: komga-webui/package-lock.json
 
-      - name: Setup Java 21
-        uses: actions/setup-java@v4
-        with:
-          java-version: 21
-          java-package: 'jdk'
-          distribution: 'temurin'
-
       - name: Setup Java 17
         uses: actions/setup-java@v4
         with:

.github/workflows/tests.yml

@@ -16,12 +16,6 @@ jobs:
     name: Test server
     steps:
       - uses: actions/checkout@v4
-      - name: Setup Java 21
-        uses: actions/setup-java@v4
-        with:
-          java-version: 21
-          java-package: 'jdk'
-          distribution: 'temurin'
       - name: Setup Java 17
         uses: actions/setup-java@v4
         with:

DEVELOPING.md

@@ -6,7 +6,7 @@ Thanks a lot for contributing to Komga!
 
 You will need:
 
-- Java JDK version 17 & 21
+- Java JDK version 17+
 - Nodejs version 18+ (check the `.nvmrc` file)
 
 ## Setting up the project

conveyor.conf

@@ -1,4 +1,5 @@
 include "#!./gradlew -q :komga-tray:printConveyorConfig"
+include required("/stdlib/jdk/21/eclipse.conf")
 
 app {
     display-name = Komga

komga-tray/build.gradle.kts

@@ -13,10 +13,6 @@ plugins {
 
 group = "org.gotson"
 
-kotlin {
-  jvmToolchain(21)
-}
-
 tasks {
   withType<JavaCompile> {
     sourceCompatibility = "17"

komga/build.gradle.kts

@@ -19,10 +19,6 @@ plugins {
   jacoco
 }
 
-kotlin {
-  jvmToolchain(17)
-}
-
 val benchmarkSourceSet =
   sourceSets.create("benchmark") {
     java {