Revert "fix: also pass in nix.conf max-jobs setting on macos"

This reverts commit b67f7ce.

Author: jfroche

.github/workflows/nix-build.yml

@@ -77,23 +77,6 @@ jobs:
           extra-conf: |
             substituters = https://cache.nixos.org https://nix-postgres-artifacts.s3.amazonaws.com
             trusted-public-keys = nix-postgres-artifacts:dGZlQOvKcNEjvT7QEAJbcV6b6uk7VF/hWMjhYleiaLI=% cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
-      - name: Install nix
-        uses: DeterminateSystems/nix-installer-action@main
-        if: ${{ github.secret_source == 'None' }} && matrix.runner == 'macos-latest-xlarge'
-        with:
-          extra-conf: |
-            max-jobs =1
-            substituters = https://cache.nixos.org https://nix-postgres-artifacts.s3.amazonaws.com
-            trusted-public-keys = nix-postgres-artifacts:dGZlQOvKcNEjvT7QEAJbcV6b6uk7VF/hWMjhYleiaLI=% cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
-      - name: Install nix
-        uses: DeterminateSystems/nix-installer-action@main
-        if: ${{ github.secret_source == 'Actions' }} && matrix.runner == 'macos-latest-xlarge'
-        with:
-          extra-conf: |
-            max-jobs = 1
-            substituters = https://cache.nixos.org https://nix-postgres-artifacts.s3.amazonaws.com
-            trusted-public-keys = nix-postgres-artifacts:dGZlQOvKcNEjvT7QEAJbcV6b6uk7VF/hWMjhYleiaLI=% cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
-            post-build-hook = /etc/nix/upload-to-cache.sh
       - name: Aggressive disk cleanup for DuckDB build
         if: matrix.runner == 'macos-latest-xlarge'
         run: |