Add dockerfile for openrct2-cli

.dockerignore

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+bin/
+build/
+lib/
+obj/

dockerfiles/openrct2-cli/Dockerfile

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+# Build OpenRCT2 using build environment image
+FROM openrct2/openrct2:ubuntu_amd64 AS build-env
+WORKDIR /openrct2
+COPY . ./
+RUN mkdir build \
+ && cd build \
+ && cmake .. -G Ninja -DCMAKE_BUILD_TYPE=release -DCMAKE_INSTALL_PREFIX=/openrct2-install/usr -DCMAKE_INSTALL_LIBDIR=/openrct2-install/usr/lib \
+ && ninja -k0 install
+
+# Build runtime image
+FROM ubuntu:16.04
+RUN apt-get update
+RUN apt-get -y upgrade
+RUN apt-get install --no-install-recommends -y rsync ca-certificates libjansson4 libpng12-0 libzip4 libcurl3 libfreetype6 libfontconfig1
+
+# Install OpenRCT2
+COPY --from=build-env /openrct2-install /openrct2-install
+RUN rsync -a /openrct2-install/* / \
+ && rm -rf /openrct2-install
+
+# Done
+ENTRYPOINT ["openrct2-cli"]