feat(radicle): Add option to run on unstable

For testing review in Freshly Baked, coded and I would like to run
unstable radicle

Change-Id: I614df5c138d4b60b6f4827fed9651e7e55ee84fc
Reviewed-on: https://git.clicks.codes/c/Chimera/NixFiles/+/843
Reviewed-by: Samuel Shuert <coded@clicks.codes>
Tested-by: Skyler Grey <minion@clicks.codes>
diff --git a/flake.nix b/flake.nix
index eb7b1d1..5cc32f3 100644
--- a/flake.nix
+++ b/flake.nix
@@ -61,6 +61,8 @@
 
     nur.url = "github:nix-community/nur";
 
+    radicle.url = "git+https://seed.radicle.xyz/z3gqcJUoA1n9HaHKufZs5FCSGazv5.git";
+
     snowfall-lib = {
       url = "github:snowfallorg/lib/dev";
       inputs.nixpkgs.follows = "nixpkgs";