Updated standalone docker file and install guide

deployment/docker/pretix.bash

@@ -0,0 +1,44 @@
+#!/bin/bash
+cd /pretix/src
+export DJANGO_SETTINGS_MODULE=production_settings
+export DATA_DIR=/data/
+NUM_WORKERS=10
+
+if [ ! -d /data/logs ]; then
+    mkdir /data/logs;
+fi
+if [ ! -d /data/media ]; then
+    mkdir /data/media;
+fi
+
+if [ "$1" == "cron" ]; then
+    exec python3 -m pretix runperiodic
+fi
+
+python3 -m pretix migrate --noinput
+
+if [ "$1" == "all" ]; then
+    exec sudo /usr/bin/supervisord -n -c /etc/supervisord.conf
+fi
+
+if [ "$1" == "webworker" ]; then
+    exec gunicorn pretix.wsgi \
+        --name pretix \
+        --workers $NUM_WORKERS \
+        --max-requests 1200 \
+        --max-requests-jitter 50 \
+        --log-level=info \
+        --bind=unix:/tmp/pretix.sock
+fi
+
+if [ "$1" == "taskworker" ]; then
+    export C_FORCE_ROOT=True
+    exec celery -A pretix worker -l info
+fi
+
+if [ "$1" == "shell" ]; then
+    exec python3 -m pretix shell
+fi
+
+echo "Specify argument: all|cron|webworker|taskworker|shell"
+exit 1