Configure registry for customer projects

I created a private repository within `registries/customer-projects`.
This holds flakes.
The folder is registered as registry.

That allows to run the following from within a customer project:

    nix run cp\#reuter-phpstan

In order to execute the customer specific application from flake.

.gitignore

@@ -0,0 +1 @@
+/registries/customer-projects/

home.nix

@@ -114,7 +114,8 @@
     "phpactor/phpactor.yml".source = ./home/files/phpactor.yml;
     "tig/config".source = ./home/files/tig;
 
-    "nix/nix.conf".source = ./home/files/nix.conf;
+    "nix/nix.conf".source = ./home/files/nix/nix.conf;
+    "nix/registry.json".source = ./home/files/nix/registry.json;
 
     "cmus/smyckblue.theme".source = ./home/files/cmus/smyckblue.theme;
     "cmus/rc".source = ./home/files/cmus/rc;

home/files/nix/registry.json

@@ -0,0 +1,15 @@
+{
+  "flakes": [
+    {
+      "from": {
+        "id": "cp",
+        "type": "indirect"
+      },
+      "to": {
+        "path": "/home/daniels/.config/nixpkgs/registries/customer-projects",
+        "type": "path"
+      }
+    }
+  ],
+  "version": 2
+}

readme.md

@@ -60,7 +60,7 @@ It has the following sub folder:
 
 `flakes/`
     Holds structure with specific flakes.
-    Those should provide libraries and template for development projects.
+    Those should provide libraries and template.
 
 Update
 ------
@@ -102,11 +102,6 @@ Todos
 
 * Migrate firefox (with geckodriver), thunderbird, ungoogled chromium
 
-* Begin migrating local development to execute php. On a per customer project.
-
-  * `flake.nix` and `flake.lock` need to be checked into a repo … How to handle that if customer doesn't want the file?
-    Maybe symlinks will work, so I've a dedicated repo with the project flakes and link them into project repos?
-
 * Migrate home manager to use flake for better rollback support if update breaks something.
 
 * Maybe PR upstream: `./home/modules/programs/languagetool.nix`.