Add Java and Gradle installation to build Dockerfile

docker/builder/Dockerfile

@@ -1,8 +1,34 @@
 FROM ubuntu:noble
 
-# Install required packages
-RUN apt-get update -y && \
-    apt-get upgrade -y && \
-    apt-get install curl gnupg2 -y && \
-    apt-get clean -y
+# Set environment variables for non-interactive installation
+ENV DEBIAN_FRONTEND=noninteractive
 
+# Update the package list and install necessary tools
+RUN apt-get update \
+    && apt-get upgrade -y \
+    && apt-get install -y \
+    wget \
+    curl \
+    unzip \
+    gnupg2
+
+# Install OpenJDK 21
+RUN wget -O- https://download.java.net/openjdk/jdk21/ri/openjdk-21+35_linux-x64_bin.tar.gz | tar xz -C /opt/
+
+# Set JAVA_HOME environment variable
+ENV JAVA_HOME=/opt/jdk-21
+ENV PATH=$JAVA_HOME/bin:$PATH
+
+# Install Gradle 8.10
+ENV GRADLE_VERSION=8.10
+
+RUN wget https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip -P /tmp \
+    && unzip -d /opt/gradle /tmp/gradle-${GRADLE_VERSION}-bin.zip \
+    && rm /tmp/gradle-${GRADLE_VERSION}-bin.zip
+
+# Set GRADLE_HOME environment variable
+ENV GRADLE_HOME=/opt/gradle/gradle-${GRADLE_VERSION}
+ENV PATH=$GRADLE_HOME/bin:$PATH
+
+# Clean up APT when done
+RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*