flake.nix: Centralize overlays

flake/nixpkgs.nix

@@ -0,0 +1,17 @@
+{ self
+, nixpkgs
+, ...
+}@inputs:
+
+let
+  mkNixpkgs = { system, ... }@args: 
+    import nixpkgs {
+      inherit system;
+      overlays = [
+        self.overlays.nixfilesInputs
+        self.overlays.clerie
+      ];
+    };
+
+in
+  nixpkgs.lib.genAttrs [ "x86_64-linux" "aarch64-linux" ] (system: mkNixpkgs { inherit system; })

flake/overlay.nix

@@ -0,0 +1,14 @@
+{ self
+, bij
+, chaosevents
+, ssh-to-age
+, ...
+}@inputs:
+final: prev: {
+  inherit (bij.packages.${final.system})
+    bij;
+  inherit (chaosevents.packages.${final.system})
+    chaosevents;
+  inherit (ssh-to-age.packages.${final.system})
+    ssh-to-age;
+}