fix: enable stickydisk again with new nix-installer-action

Author: jfroche

.github/actions/nix-install-ephemeral/action.yml

@@ -40,11 +40,10 @@ runs:
         sudo chmod +x /etc/nix/upload-to-cache.sh
       env:
         NIX_SIGN_SECRET_KEY: ${{ env.NIX_SIGN_SECRET_KEY }}
-    - name: Install nix
-      uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
+    - uses: NixOS/nix-installer-action@d6ef7ecd8f685af89869e5aca0580a33e3e3150c
       with:
-        install_url: https://releases.nixos.org/nix/nix-2.32.2/install
-        extra_nix_config: |
+        installer-version: 2.33.1
+        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=
           ${{ inputs.push-to-cache == 'true' && 'post-build-hook = /etc/nix/upload-to-cache.sh' || '' }}

.github/workflows/nix-eval.yml

@@ -24,6 +24,15 @@ jobs:
     steps:
       - name: Checkout Repo
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - name: Mount Nix cache disk
+        uses: useblacksmith/stickydisk@a652394bf1bf95399f406e648482b41fbd25c51f # v1
+        with:
+          key: ${{ github.repository }}-nix-cache-eval-${{ runner.os }}
+          path: /nix
+      - name: Remove existing Nix socket
+        run: |
+          sudo rm /nix/var/nix/daemon-socket/socket /nix/receipt.json || true
+          sudo chown root /nix /nix/var /nix/var/nix || true
       - name: Install nix
         uses: ./.github/actions/nix-install-ephemeral
         with: