Add centos-7

docker/centos-7/Dockerfile

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+# The base image
+FROM centos:7
+
+# Set environment variables
+ENV DIST_NAME=centos-7
+ENV USER=wxpy
+ENV HOME=/home/$USER
+ENV PYTHONUNBUFFERED=1
+ENV PATH=$HOME/bin:$PATH
+ENV GTK2_OK=yes
+
+
+# Update and install basic OS packages
+RUN \
+        yum -y install https://centos7.iuscommunity.org/ius-release.rpm; \
+        yum -y update; \
+        yum -y group install development; \
+        yum -y install sudo nano which; \
+# Set up a user, and etc.
+        mkdir -p /dist; \
+        adduser -m ${USER}; \
+        echo "${USER} ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers; \
+# Install development packages needed for building wxPython
+        yum -y install \
+                freeglut-devel \
+                gstreamer1-devel \
+                gstreamer1-plugins-base-devel \
+                gtk2-devel \
+                gtk3-devel \
+                libjpeg-turbo-devel \
+                libnotify \
+                libnotify-devel \
+                libpng-devel \
+                libSM-devel \
+                libtiff-devel \
+                libXtst-devel \
+                SDL-devel \
+                webkitgtk-devel \
+                webkitgtk3-devel \
+                webkitgtk4-devel; \
+# Install all available Python packages and their dev packages
+        yum -y install python python-tools python-devel python-virtualenv; \
+        yum -y install python36u python36u-tools python36u-devel; \
+# CLean up the yum caches
+        yum clean all;
+
+# Set the user and group to use for the rest of the commands
+USER ${USER}:${USER}
+
+# Set the working directory
+WORKDIR ${HOME}
+
+# Create virtual environments for each Python
+RUN \
+        cd ${HOME}; \
+        mkdir -p ${HOME}/venvs; \
+        python2.7 -m virtualenv --python=python2.7 venvs/Py27; \
+        python3.6 -m venv venvs/Py36;
+
+# Add files from host into the container
+COPY scripts ${HOME}/bin
+
+# Define default command
+CMD ["/bin/bash", "-l"]
+