import_osm.sh fails in user-mode on Docker Toolbox for Windows

[zstadler]

Using Docker Toolbox for Windows, when import_osm.sh is run in user-mode, as in make import-osm, it fails with an error:

$ docker-compose run --rm -u 197609:197121 import-osm
Importing in diff mode
[May 10 15:33:23] [INFO] removing existing cache /cache
[May 10 15:33:23] IO error: /cache/coords: Invalid argument
[May 10 15:33:23] Reading OSM data

[zstadler]

• With ./cache as a mounted volume, even running import-osm as root in docker fails:

  IO error: /cache/coords: Invalid argument
  Makefile:174: recipe for target 'import-osm' failed
  

  I assume imposm is trying to perform something that the mounted ntfs filesystem does not support.
  It would be interesting to see if this happen also in the latest imposm release.

• With cache as a named volume, both import-osm and import-wikidata must be run as root in docker in order to succeed.

• With cache as a named volume, running 'import-osm' as a user in docker succeeds if /cache permissions are change a-la /tmp - chmod a+rwxt /cache.
  This was run as root in docker as part of the make init-dirs actions.