Add support for host mounts (fixes #94)

run.sh

@@ -24,6 +24,12 @@ if [ "$#" -ne 1 ]; then
 fi
 
 if [ "$1" = "import" ]; then
+    # Ensure that database directory is in right state
+    chown postgres:postgres -R /var/lib/postgresql
+    if [ ! -f /var/lib/postgresql/12/main/PG_VERSION ]; then
+        sudo -u postgres /usr/lib/postgresql/12/bin/pg_ctl -D /var/lib/postgresql/12/main/ initdb -o "--locale C.UTF-8"
+    fi
+
     # Initialize PostgreSQL
     createPostgresConfig
     service postgresql start