Dockerfile: add a dockerfile that install docurium with its dependencies

.dockerignore

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+*.gem
+pkg

Dockerfile

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+# Dependencies we need available when running
+ARG RUN_DEPS="ruby-dev llvm libclang-3.8-dev python-pygments libffi6"
+
+FROM debian:stretch-slim as builder
+
+# Extra dependencies we need in the build container
+ARG BUILD_DEPS="git cmake pkg-config build-essential libffi-dev libssl-dev"
+
+# takes the global value defined above
+ARG RUN_DEPS
+
+# We need these packages to build ruby extensions, rugged and to parse the C
+# code. pygments is there to highlight the code examples.
+RUN apt update && \
+    apt install -y --no-install-recommends ${BUILD_DEPS} ${RUN_DEPS} && \
+    apt clean && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /docurium
+
+# This is here so we can provide a unique argument per run so docker does not
+# consider the rest of the file cached and wealways install the latest version
+# of docurium
+ARG CACHEBUST=1
+
+COPY . /docurium/
+RUN gem build docurium && gem install docurium-*.gem --no-ri --no-rdoc
+
+FROM debian:stretch-slim
+
+# takes the global value defined above
+ARG RUN_DEPS
+RUN apt update && \
+    apt install -y --no-install-recommends ${RUN_DEPS} && \
+    apt clean && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /var/lib/gems/ /var/lib/gems/
+COPY --from=builder /usr/local/bin/cm /usr/local/bin/cm