feat: use git river version

flake.lock

@@ -1071,6 +1071,24 @@
         "type": "github"
       }
     },
+    "river": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1711107438,
+        "narHash": "sha256-4nvFniKdJX+ZsoliFmWSzIAtZefekBCxmGS9xonHQN8=",
+        "ref": "refs/heads/master",
+        "rev": "b77b42f0d640457411204bbae346df1d1a0c4f44",
+        "revCount": 1214,
+        "submodules": true,
+        "type": "git",
+        "url": "https://github.com/riverwm/river"
+      },
+      "original": {
+        "submodules": true,
+        "type": "git",
+        "url": "https://github.com/riverwm/river"
+      }
+    },
     "root": {
       "inputs": {
         "actions-preview-nvim": "actions-preview-nvim",
@@ -1099,6 +1117,7 @@
         "nur": "nur",
         "nvim-lspconfig": "nvim-lspconfig",
         "pre-commit-hooks": "pre-commit-hooks",
+        "river": "river",
         "smartcolumn-nvim": "smartcolumn-nvim",
         "stable": "stable",
         "statuscol-nvim": "statuscol-nvim",