Update Dockerfile

Dockerfile

@@ -3,15 +3,15 @@ FROM python:3.11-slim
 ENV DEBIAN_FRONTEND=noninteractive \
     ANDROID_SDK_ROOT=/opt/android-sdk \
     ANDROID_HOME=/opt/android-sdk \
-    JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 \
+    JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64 \
     GRADLE_USER_HOME=/tmp/.gradle \
     HF_HOME=/tmp/hf_cache \
-    PATH=/opt/android-sdk/cmdline-tools/latest/bin:/opt/android-sdk/platform-tools:/usr/lib/jvm/java-17-openjdk-amd64/bin:$PATH
+    PATH=/opt/android-sdk/cmdline-tools/latest/bin:/opt/android-sdk/platform-tools:/usr/lib/jvm/java-21-openjdk-amd64/bin:/opt/gradle-8.7/bin:$PATH
 
 # Base tooling
 RUN apt-get update && apt-get install -y --no-install-recommends \
     git curl wget unzip zip ca-certificates \
-    openjdk-17-jdk-headless \
+    openjdk-21-jdk-headless \
     build-essential cmake \
     && rm -rf /var/lib/apt/lists/*
 
@@ -31,7 +31,7 @@ RUN wget -q https://services.gradle.org/distributions/gradle-8.7-bin.zip -O /tmp
     ln -s /opt/gradle-8.7/bin/gradle /usr/local/bin/gradle && \
     rm /tmp/gradle.zip
 
-# Workdir + perms (HF Spaces runs as user 1000)
+# HF Spaces runs as user 1000
 RUN useradd -m -u 1000 user && \
     mkdir -p /app /workspace /tmp/.gradle /tmp/hf_cache && \
     chown -R user:user /app /workspace /tmp/.gradle /tmp/hf_cache $ANDROID_SDK_ROOT