Add basic Nix flake

drupal-cms/.envrc

@@ -0,0 +1 @@
+use flake

drupal-cms/flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1758198701,
+        "narHash": "sha256-7To75JlpekfUmdkUZewnT6MoBANS0XVypW6kjUOXQwc=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "0147c2f1d54b30b5dd6d4a8c8542e8d7edf93b5d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

drupal-cms/flake.nix

@@ -0,0 +1,25 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs =
+    inputs:
+    let
+      system = "x86_64-linux";
+      pkgs = import inputs.nixpkgs { inherit system; };
+    in
+    {
+      devShells.${system}.default = pkgs.mkShell {
+        packages = with pkgs; [
+          (php.buildEnv {
+            extraConfig = ''
+              memory_limit = 512M
+            '';
+          })
+
+          sqlite
+        ];
+      };
+    };
+}