Build docker image in gitlab, add docs for turn key docker setup

docker/Dockerfile

@@ -0,0 +1,49 @@
+FROM python:3.9-slim
+ARG AUTH_VERSION=2.9.0
+ARG AUTH_PACKAGE=allianceauth==${AUTH_VERSION}
+ENV VIRTUAL_ENV=/opt/venv
+ENV AUTH_USER=allianceauth
+ENV AUTH_GROUP=allianceauth
+ENV AUTH_USERGROUP=${AUTH_USER}:${AUTH_GROUP}
+ENV STATIC_BASE=/var/www
+ENV AUTH_HOME=/home/allianceauth
+
+# Setup user and directory permissions
+SHELL ["/bin/bash", "-c"]
+RUN groupadd -g 61000 ${AUTH_GROUP}
+RUN useradd -g 61000 -l -M -s /bin/false -u 61000 ${AUTH_USER}
+RUN mkdir -p ${VIRTUAL_ENV} \
+    && chown ${AUTH_USERGROUP} ${VIRTUAL_ENV} \
+    && mkdir -p ${STATIC_BASE} \
+    && chown ${AUTH_USERGROUP} ${STATIC_BASE} \
+    && mkdir -p ${AUTH_HOME} \
+    && chown ${AUTH_USERGROUP} ${AUTH_HOME}
+
+# Install build dependencies
+RUN apt-get update && apt-get upgrade -y && apt-get install -y \
+    libmariadb-dev gcc supervisor git htop
+
+# Switch to non-root user
+USER ${AUTH_USER}
+RUN python3 -m venv $VIRTUAL_ENV
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+WORKDIR ${AUTH_HOME}
+
+# Install python dependencies
+RUN pip install --upgrade pip
+RUN pip install wheel gunicorn
+RUN pip install ${AUTH_PACKAGE}
+
+# Initialize auth
+RUN allianceauth start myauth
+COPY /allianceauth/project_template/project_name/settings/local.py ${AUTH_HOME}/myauth/myauth/settings/local.py
+RUN allianceauth update myauth
+RUN mkdir -p ${STATIC_BASE}/myauth/static
+RUN python ${AUTH_HOME}/myauth/manage.py collectstatic --noinput
+COPY /docker/conf/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+RUN echo 'alias auth="python $AUTH_HOME/myauth/manage.py"' >> ~/.bashrc && \
+    echo 'alias supervisord="supervisord -c /etc/supervisor/conf.d/supervisord.conf"' >> ~/.bashrc && \
+    source ~/.bashrc
+
+EXPOSE 8000
+CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]