add dev flake

flake.lock

@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1735531152,
+        "narHash": "sha256-As8I+ebItDKtboWgDXYZSIjGlKeqiLBvjxsQHUmAf1Q=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "3ffbbdbac0566a0977da3d2657b89cbcfe9a173b",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-24.11",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,65 @@
+{
+  description = "Invoiceplane invoice template development shell";
+
+  inputs.nixpkgs.url = "nixpkgs/nixos-24.11";
+
+  outputs = { self, nixpkgs, ... }@inputs:
+  let
+    pkgs = nixpkgs.legacyPackages.x86_64-linux;
+    start =
+      pkgs.writeShellScriptBin "start" ''
+        set -e
+        export QEMU_NET_OPTS="hostfwd=tcp::8080-:80"
+        ${pkgs.nixos-shell}/bin/nixos-shell --flake .
+       '';
+  in {
+    nixosConfigurations.vm = nixpkgs.lib.nixosSystem {
+      system = "x86_64-linux";
+      specialArgs.inputs = inputs;
+      pkgs = import nixpkgs {
+	overlays = [
+          (self: super: {
+            invoiceplane = super.invoiceplane.overrideAttrs (oldAttrs: rec {
+              installPhase = oldAttrs.installPhase + ''
+                rm -r $out/application/views/invoice_templates/pdf
+                ln -sf /var/lib/invoiceplane/localhost/pdf $out/application/views/invoice_templates/pdf
+              '';
+            });
+          })
+        ];
+      };
+      modules = [
+        ({ lib, config, pkgs, ... }: {
+
+	  services.invoiceplane.sites."localhost" = {
+	    enable = true;
+	    settings.IP_URL = "http://localhost:8080";
+	  };
+
+          nixos-shell.mounts.extraMounts = {
+            "/var/lib/invoiceplane/localhost/pdf" = {
+               target = /home/onny/projects/invoiceplane-vtdirektmarketing;
+               cache = "none";
+            };
+          };
+
+          system.stateVersion = "24.11";
+          services.getty.autologinUser = "root";
+          documentation = {
+            info.enable = false;
+            man.enable = false;
+            nixos.enable = false;
+          };
+          nix = {
+            registry.nixpkgs.flake = inputs.nixpkgs;
+            settings.experimental-features = [ "nix-command" "flakes" ];
+          };
+        })
+      ];
+    };
+
+    packages = { inherit start; };
+    defaultPackage.x86_64-linux = start;
+
+  };
+}