added docker compose file

deployment/docker/prepare.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+set -e
+
+COMMIT="$(git rev-parse HEAD)"
+
+echo "creating data directory"
+mkdir -p data
+
+echo "making sure there is a c3nav.cfg in the data dir"
+touch data/c3nav.cfg
+
+echo "changing permissions to match container permissions"
+set -x
+sudo chgrp -R 500 data
+sudo chmod -R g+rwX data
+set +x
+
+if [[ ! -f .env ]]; then
+  echo "copying example env file"
+  cp example.env .env
+fi
+echo "updating tag"
+sed -i "s/C3NAV_TAG=.*/C3NAV_TAG=${COMMIT}/g" .env
+
+echo "DONE! You can now run \"docker compose up\" to start a test instance"