provide authentik components in separate scope

* provides a new function `lib.mkAuthentikScope` as a flake output to
  create a custom scope with overrides outside of this flake
* adds a slightly altered version of existing vm test to demonstrate the
  usage of `mkAuthentikScope` for overriding individual authentik
  components in tests/override-scope.nix

components/default.nix

@@ -0,0 +1,48 @@
+{ authentik-src
+, authentik-version
+, authentikPoetryOverrides
+, buildNapalmPackage
+, defaultPoetryOverrides
+, mkPoetryEnv
+, pkgs
+}:
+
+pkgs.lib.makeScope pkgs.newScope (final:
+  let
+    docs = final.callPackage ./docs.nix {
+      inherit authentik-src authentik-version buildNapalmPackage;
+    };
+    frontend = final.callPackage ./frontend.nix {
+      inherit authentik-src authentik-version buildNapalmPackage;
+    };
+    pythonEnv = final.callPackage ./pythonEnv.nix {
+      inherit authentik-src mkPoetryEnv defaultPoetryOverrides authentikPoetryOverrides;
+    };
+    # server + outposts
+    gopkgs = final.callPackage ./gopkgs.nix {
+      inherit authentik-src authentik-version;
+    };
+    staticWorkdirDeps = final.callPackage ./staticWorkdirDeps.nix {
+      inherit authentik-src;
+    };
+    migrate = final.callPackage ./migrate.nix {
+      inherit authentik-src;
+    };
+    # worker
+    celery = final.callPackage ./celery.nix {
+    };
+  in
+  {
+    authentikComponents = {
+      inherit
+        docs
+        frontend
+        pythonEnv
+        gopkgs
+        staticWorkdirDeps
+        migrate
+        celery;
+    };
+    inherit authentik-src authentik-version;
+  }
+)