Error: you need to download the country_osm_grid first while building nominatim image

http://www.nominatim.org/ is not working. I am trying to build docker image for nominatim. The build does not proceed until it downloads country grid data from nominatim.org but the website has not been working all day.

Is this a known issue? I am building nominatim image for the first time so I don't know if the website has been down for months but do anyone know workaround?

I tried to skip the command which download this data from dockerfile, and by doing so I can successfully create nominatim image but when I try to run container, I get this error Error: you need to download the country_osm_grid first

so it seems I can't proceed further until I downlaod this data. Where can I download this?

the command in dockerfile is, RUN curl https://www.nominatim.org/data/country_grid.sql.gz > /app/src/data/country_osm_grid.sql.gz