add github access token for nix installer

Signed-off-by: Thing-han, Lim <[email protected]>

.github/actions/setup-nix/action.yml

@@ -31,6 +31,7 @@ runs:
         curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install --no-confirm \
         --extra-conf "trusted-users = root ${USER:-}" \
         --extra-conf "experimental-features = nix-command flakes" \
+        --extra-conf "access-tokens = github.com=$GITHUB_TOKEN"
     - name: Post-check nix
       shell: bash
       run: |