mod: added nix install action

unstable to 25.11

.gitea/workflows/publish-attic.yaml

@@ -8,18 +8,21 @@ on:
 
 jobs:
   publish:
-    runs-on: nixos/nix
+    runs-on: ubuntu-latest
 
     env:
       ATTIC_SERVER: ${{ secrets.ATTIC_SERVER }}
       ATTIC_CACHE: ${{ secrets.ATTIC_CACHE }}
       ATTIC_TOKEN: ${{ secrets.ATTIC_TOKEN }}
-      NIX_CONFIG: experimental-features = nix-command flakes
+      # NIX_CONFIG: experimental-features = nix-command flakes
 
     steps:
       - name: Check out repository
         uses: actions/checkout@v4
 
+      - name: Install upstream Nix
+        uses: cachix/install-nix-action@v31
+
       - name: Install Attic client
         shell: bash
         run: |

flake.lock

@@ -74,16 +74,16 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1779357205,
+        "lastModified": 1779467186,
-        "narHash": "sha256-cCO8aTqss5x9Ky8GWkpY0Hy5fyTZEbtifSUV8QjSzic=",
+        "narHash": "sha256-nOesoDCiXcUftqbRBMz9tt4blI5PvljMWbm3kuCA+0s=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f83fc3c307e74bc5fd5adb7eb6b8b13ffd2a36e1",
+        "rev": "b77b3de8775677f84492abe84635f87b0e153f0f",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-unstable",
+        "ref": "nixos-25.11",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -2,7 +2,7 @@
   description = "Miller Nix User Repository";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
     flake-utils.url = "github:numtide/flake-utils";
     home-manager.url = "github:nix-community/home-manager";
     darwin.url = "github:LnL7/nix-darwin";