Add preCheck for SSL_CERT_FILE for nix profile install and flake on (#12)

systems without existing path

Author: bigFin

flake.nix

@@ -51,6 +51,9 @@
               darwin.apple_sdk.frameworks.CoreServices
             ];
 
+          preCheck = ''
+            export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt
+          '';
           checkFlags = [
             "--skip=tokenizer::tests::test_hf_counter"
           ];