add nix-flatpak

flake.lock

@@ -72,6 +72,22 @@
         "type": "github"
       }
     },
+    "nix-flatpak": {
+      "locked": {
+        "lastModified": 1767983141,
+        "narHash": "sha256-7ZCulYUD9RmJIDULTRkGLSW1faMpDlPKcbWJLYHoXcs=",
+        "owner": "gmodena",
+        "repo": "nix-flatpak",
+        "rev": "440818969ac2cbd77bfe025e884d0aa528991374",
+        "type": "github"
+      },
+      "original": {
+        "owner": "gmodena",
+        "ref": "v0.7.0",
+        "repo": "nix-flatpak",
+        "type": "github"
+      }
+    },
     "nix-github-actions": {
       "inputs": {
         "nixpkgs": [
@@ -161,6 +177,7 @@
       "inputs": {
         "colmena": "colmena",
         "grub2-themes": "grub2-themes",
+        "nix-flatpak": "nix-flatpak",
         "nixpkgs": "nixpkgs_3",
         "nixpkgs-unstable": "nixpkgs-unstable"
       }

flake.nix

@@ -7,6 +7,8 @@
 
     colmena.url = "github:zhaofengli/colmena/?rev=47b6414d800c8471e98ca072bc0835345741a56a";
 
+    nix-flatpak.url = "github:gmodena/nix-flatpak/?ref=v0.7.0";
+
     grub2-themes.url = "github:vinceliuice/grub2-themes";
   };