Add Dockerfile

Dockerfile

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+FROM debian:stable-slim
+LABEL maintainer="mr-vercetti"
+
+# Install dependencies
+RUN dpkg --add-architecture i386 && \
+    apt-get update && apt-get install -y \
+        bzip2 ca-certificates curl libarchive13 libstdc++6 lib32gcc-s1 libssl1.1:i386 \
+        libstdc++6:i386 locales locales-all tmux zlib1g:i386 p7zip-full tar unzip wget xz-utils && \
+    sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && \
+        locale-gen --no-purge en_US.UTF-8 && \
+    apt-get clean && rm -rf /tmp/* /var/lib/apt/lists/* /var/tmp/*
+
+ENV LANG=en_US.UTF-8 LANGUAGE=en_US.UTF-8
+ENV APP_DIR="/app"
+ENV STEAMCMD_DIR="${APP_DIR}/Steam/steamcmd"
+
+# Set up user environment
+RUN groupadd -r abc && \
+    useradd -d ${APP_DIR} -r -g abc abc && \
+    mkdir -p ${STEAMCMD_DIR} && \
+    chown -R abc:abc ${APP_DIR}
+
+USER abc
+WORKDIR ${APP_DIR}
+
+# Download and update steamcmd
+RUN wget -qO- http://media.steampowered.com/installer/steamcmd_linux.tar.gz | tar xz -C ${STEAMCMD_DIR} && \
+    chmod +x ${STEAMCMD_DIR}/steamcmd.sh && \
+    ${STEAMCMD_DIR}/steamcmd.sh +force_install_dir ${STEAMCMD_DIR} +login anonymous +quit