Add Dockerfile

Dockerfile

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+FROM ghcr.io/linuxserver/baseimage-kasmvnc-ubuntu-jammy:latest
+
+USER root
+
+# Install Java 17 and utilities
+RUN apt update && apt install -y openjdk-17-jre wget bzip2 && rm -rf /var/lib/apt/lists/*
+
+# Create Forge + config folders
+RUN mkdir -p /opt/forge /config /home/kasm-user/.forge
+
+# Link persistent storage to Forge expected location
+RUN ln -s /config /home/kasm-user/.forge
+
+# Add startup script
+COPY start.sh /start.sh
+RUN chmod +x /start.sh
+
+USER 1000
+WORKDIR /home/kasm-user
+
+CMD ["/start.sh"]