fix: remove sudo from Darwin sccache setup

Removes sudo commands from Darwin self-hosted runner sccache configuration.
The macOS self-hosted runners don't have sudo available, and the user
already has the necessary permissions to create directories under /nix
and modify /etc/nix/nix.conf.

Author: yvan-sraka

.github/workflows/nix-build.yml

@@ -139,13 +139,12 @@ jobs:
         if: ${{ matrix.attr != '' && matrix.postgresql_version }}
         run: |
           # Ensure sccache directory is writable by the build user
-          sudo mkdir -p /nix/var/cache/sccache
-          sudo chown -R $(whoami) /nix/var/cache/sccache
-          sudo chmod -R 755 /nix/var/cache/sccache
+          mkdir -p /nix/var/cache/sccache
+          chmod -R 755 /nix/var/cache/sccache
           
           # Update Nix configuration to allow access to sccache directory in sandbox
           # Create temporary nix.conf with our additions
-          sudo tee -a /etc/nix/nix.conf > /dev/null <<EOF
+          tee -a /etc/nix/nix.conf > /dev/null <<EOF
           extra-sandbox-paths = /nix/var/cache/sccache
           EOF
       - name: nix build
@@ -181,13 +180,12 @@ jobs:
         if: ${{ matrix.attr != '' && matrix.postgresql_version }}
         run: |
           # Ensure sccache directory is writable by the build user
-          sudo mkdir -p /nix/var/cache/sccache
-          sudo chown -R $(whoami) /nix/var/cache/sccache
-          sudo chmod -R 755 /nix/var/cache/sccache
+          mkdir -p /nix/var/cache/sccache
+          chmod -R 755 /nix/var/cache/sccache
           
           # Update Nix configuration to allow access to sccache directory in sandbox
           # Create temporary nix.conf with our additions
-          sudo tee -a /etc/nix/nix.conf > /dev/null <<EOF
+          tee -a /etc/nix/nix.conf > /dev/null <<EOF
           extra-sandbox-paths = /nix/var/cache/sccache
           EOF
       - name: nix build