Add Dockerfile (bench 5942433)

.dockerignore

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+*

Dockerfile

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+FROM nimlang/nim:2.0.4-ubuntu-regular
+
+RUN apt update && apt-get -y install git clang llvm lld
+
+
+WORKDIR /app
+
+COPY . /app/
+
+# Force cache to be thrown away when new commits are pushed
+ADD https://api.github.com/repos/nocturn9x/heimdall/git/refs/heads/master /.git-hashref
+
+
+RUN git clone https://github.com/nocturn9x/heimdall --depth 1 && \
+    cd heimdall && nimble build -y
+
+
+CMD ["heimdall/bin/heimdall"]