warn about FLAT_NODES w/ UPDATES incompatibility (#282)

See https://github.com/Zverik/regional/issues/17

README.md

@@ -232,6 +232,8 @@ docker run \
     import
 ```
 
+Warning: enabling `FLAT_NOTES` together with `UPDATES` only works for entire planet imports (without a `.poly` file).  Otherwise this will break the automatic update script. This is because trimming the differential updates to the specific regions currently isn't supported when using flat nodes.
+
 ### Benchmarks
 
 You can find an example of the import performance to expect with this image on the [OpenStreetMap wiki](https://wiki.openstreetmap.org/wiki/Osm2pgsql/benchmarks#debian_9_.2F_openstreetmap-tile-server).

run.sh

@@ -42,6 +42,8 @@ fi
 
 if [ "$1" == "import" ]; then
     # Ensure that database directory is in right state
+    mkdir -p /data/database/postgres/
+    chown renderer: /data/database/
     chown -R postgres: /var/lib/postgresql /data/database/postgres/
     if [ ! -f /data/database/postgres/PG_VERSION ]; then
         sudo -u postgres /usr/lib/postgresql/14/bin/pg_ctl -D /data/database/postgres/ initdb -o "--locale C.UTF-8"