Set libpq path for pg_dump in fast_import #10216
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Without that psql uses library from apt package libpq5 which is a transitive dependency of libgdal28 which is needed for postgis extension. And that thing overshadows proper libpq that we install:
In theory we could try to clean up image from that old libpq, but IMO it not worth it. Always setting LD_LIBRARY_PATH should be robust enough, and would work for all versions/archs.