Add athens app build files for cloudron

Dockerfile

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+FROM cloudron/base:3.0.0@sha256:455c70428723e3a823198c57472785437eb6eab082e79b3ff04ea584faf46e92
+
+RUN mkdir -p /app/code
+WORKDIR /app/code
+
+RUN apt-get update -y && apt-get install -y leiningen && rm -rf /var/lib/apt/lists/*
+
+ARG VERSION=v1.0.0-beta.49
+RUN curl -L https://github.com/athensresearch/athens/archive/${VERSION}.tar.gz | tar -xz --strip-components 1 -f -
+
+RUN yarn --frozen-lockfile
+RUN lein do compile
+
+COPY start.sh /app/code/start.sh
+
+CMD /app/code/start.sh
+