Switch to java 22 and enable preview features in runtime (#53)

* Update Dockerfile

* Update TeamServer.java

Author: Goldmensch

Dockerfile

@@ -5,7 +5,7 @@ COPY . .
 RUN gradle clean :bot:build :plugin-paper:build --no-daemon
 
 # We use a jammy image because we need some more stuff than alpine provides
-FROM eclipse-temurin:21-jammy as runtime
+FROM eclipse-temurin:22-jammy as runtime
 
 WORKDIR /app
 RUN apt update

bot/src/main/java/de/chojo/gamejam/server/TeamServer.java

@@ -182,6 +182,7 @@ public boolean start() {
         command.add("-Dpluginjam.team.name=" + teamName());
         command.add("-Djavalin.port=" + apiPort);
         command.add("-Dcom.mojang.eula.agree=true");
+        command.add("--enable-preview");
         command.add("-jar");
         command.add("server.jar");
         command.add("--max-players");