add dockerfile

Dockerfile

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+ARG GAME_DIR
+
+FROM ubuntu:18.04
+
+WORKDIR /
+
+RUN apt-get update
+RUN apt-get upgrade -y
+RUN apt-get install -y git curl libatomic1
+
+# Install elan
+RUN curl -sSfL https://github.com/leanprover/elan/releases/download/v1.4.2/elan-x86_64-unknown-linux-gnu.tar.gz | tar xz
+RUN ./elan-init -y --default-toolchain leanprover/lean4:nightly-2022-09-23
+# TODO: Read out lean version from lean-toolchain file
+ENV PATH="${PATH}:/root/.elan/bin"
+
+
+FROM elan:latest
+
+WORKDIR /
+
+# Copy lean files
+COPY lake-packages/lean4game/server/GameServer ./GameServer
+COPY lake-packages/lean4game/server/Main.lean ./Main
+COPY lake-packages/lean4game/server/lakefile.lean ./lakefile.lean
+COPY lake-packages/lean4game/server/lake-manifest.json ./lake-manifest.json
+COPY lake-packages/lean4game/server/lean-toolchain ./lean-toolchain
+COPY $GAME_DIR ./$GAME_DIR
+# TODO: make `adam` a build argument
+
+WORKDIR /
+RUN rm -f ./build/bin/gameserver
+RUN lake build
+
+WORKDIR /build/bin/