try determinate systems nix

.gitea/workflows/build-and-publish.yaml

@@ -14,16 +14,11 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
         
-      - name: Install Nix
-        uses: cachix/install-nix-action@v26
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            experimental-features = nix-command flakes
+      - uses: DeterminateSystems/determinate-nix-action@v3
             
       - name: Build Docker Image via Nix Flake
         run: |
-          HOME=/tmp/homeless-shelter nix build ./build#dockerImage --impure --print-build-logs
+          nix build ./build#dockerImage --print-build-logs
           docker load < result
           
       - name: Log in to Gitea Container Registry