Test Docker user

docker/linux/Dockerfile

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+FROM ubuntu:latest
+WORKDIR /workdir
+RUN apt-get update
+RUN apt-get install -y \
+  build-essential \
+  cmake \
+  python3 \
+  python3-pip \
+  python3-polib \
+  python3-pil \
+  libsdl2-dev \
+  libgl1-mesa-dev \
+  libzip-dev \
+  python3-dotenv \
+  python3-pyqt5 \
+  python3-opengl \
+  liblua5.3-dev \
+  xz-utils \
+  git
+VOLUME ["/workdir"]