Add Ubuntu build Docker image

docker/Dockerfile.ubuntu

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+FROM ubuntu
+LABEL maintainer="Wassim DHIF <wassimdhif@gmail.com>"
+
+ENV NPROC=1
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends software-properties-common apt-utils \
+    && add-apt-repository ppa:openmw/openmw \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends openmw openmw-launcher \
+    && apt-get install -y --no-install-recommends git build-essential cmake \
+    libopenal-dev libopenscenegraph-dev libbullet-dev libsdl2-dev \
+    libmygui-dev libunshield-dev liblz4-dev libtinyxml-dev libqt5opengl5-dev \
+    libboost-filesystem-dev libboost-program-options-dev libboost-iostreams-dev \
+    libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libswresample-dev \
+    librecastnavigation-dev libluajit-5.1-dev
+
+COPY build.sh /build.sh
+
+RUN mkdir /openmw
+WORKDIR /openmw
+
+ENTRYPOINT ["/build.sh"]

docker/README.md

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+# Build OpenMW using Docker
+
+## Build Docker image
+
+Replace `LINUX_VERSION` with the Linux distribution you wish to use.
+```
+docker build -f Dockerfile.LINUX_VERSION -t openmw.LINUX_VERSION .
+```
+
+## Build OpenMW using Docker
+
+Labeling systems like SELinux require that proper labels are placed on volume content mounted into a container.
+Without a label, the security system might prevent the processes running inside the container from using the content.
+The Z option tells Docker to label the content with a private unshared label.
+```
+docker run -v /path/to/openmw:/openmw:Z -e NPROC=2 -it openmw.LINUX_VERSION
+```

docker/build.sh

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+#!/usr/bin/env bash
+
+set -xe
+
+# Creating build directory...
+mkdir -p build
+cd build
+
+# Running CMake...
+cmake ../
+
+# Building with $NPROC CPU...
+make -j $NPROC