Log `TMPDIR` environment variable
Log `TMPDIR` environment variable

Can be set to override temporary directory for VIPS:
https://www.libvips.org/API/current/VipsImage.html#vips-image-new-temp-file

zoomhub/zoomhub,zoomhub/zoomhub,zoomhub/zoomhub,zoomhub/zoomhub