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+FROM debian:buster-slim
+
+SHELL ["/bin/bash", "-c"]
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt update -yq && \
+    apt install -yq --no-install-recommends \
+        build-essential \
+        ca-certificates wget \
+        sudo
+
+# Creating regular user 'developer':
+ARG USER=developer
+RUN addgroup "$USER" && \
+    adduser --disabled-password --gecos "" --ingroup "$USER" --home "/home/$USER" "$USER" && \
+    addgroup "$USER" sudo && \
+    echo -e '%sudo ALL=(ALL) NOPASSWD:ALL\nDefaults env_keep += "HOME"' >> /etc/sudoers
+
+USER "$USER"
+ENV src_dir="/home/$USER/src"
+RUN mkdir -p -- "$src_dir/docker"
+WORKDIR "$src_dir/docker"
+
+ENV PATH="/home/$USER/.local/bin:$PATH"
+
+COPY ["docker/Makefile", "./"]
+RUN sudo make ruby-install && \
+    sudo make ruby-install/clean && \
+    make ruby && \
+    sudo make chruby && \
+    sudo make chruby/profile.d && \
+    sudo make chruby/clean && \
+    make bundler
+
+COPY ["Gemfile", "Gemfile.lock", "../"]
+RUN make dependencies
+
+COPY [".", "../"]
+RUN sudo chown -R "$USER:$USER" ../
+CMD make jekyll/serve