add Dockerfile (#187)

.dockerignore

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+checkpoints/

Dockerfile

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+ARG IMAGE=nvidia/cuda:10.2-cudnn7-devel-ubuntu18.04
+FROM $IMAGE
+
+ENV JULIA_CUDA_USE_BINARYBUILDER=false
+
+# julia
+
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive \
+    apt-get install --yes --no-install-recommends \
+                    # basic stuff
+                    curl ca-certificates && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# NOTE: this extracts the Julia version (assumed major.minor.patch) from the
+#       Project.toml to keep it in sync with the GitHub Action workflow.
+
+RUN VERSION=1.5.3 && \
+    RELEASE=$(echo $VERSION | cut -d '.' -f 1,2 ) && \
+    curl -s -L https://julialang-s3.julialang.org/bin/linux/x64/${RELEASE}/julia-${VERSION}-linux-x86_64.tar.gz | \
+    tar -C /usr/local -x -z --strip-components=1 -f -
+
+COPY . /rl
+
+RUN julia -e 'using Pkg; Pkg.dev(url="/rl"); Pkg.instantiate(); Pkg.API.precompile()'
+
+ENTRYPOINT ["/usr/local/bin/julia"]