chore(example/without-flake-parts): init (#372)

A useful addition that demonstrates more ways to use `services-flake`

doc/examples.md

@@ -2,3 +2,5 @@
 
 - [[share-services]]#
 - [[llm]]#
+- [[without-flake-parts]]#
+

doc/without-flake-parts.md

@@ -0,0 +1,6 @@
+# Services for flakes without flake-parts
+
+`process-compose-flake` provides the [`makeProcessCompose`](https://github.com/Platonic-Systems/process-compose-flake/blob/644a8a129f17d23df9e6cf58c9bb1097a0959ab1/nix/lib.nix#L48-L53) function, which accepts custom configurations and returns the [process-compose](https://github.com/F1bonacc1/process-compose) package.
+
+For usage, refer to <https://github.com/juspay/services-flake/tree/main/example/without-flake-parts>.
+

example/without-flake-parts/flake.nix

@@ -0,0 +1,30 @@
+{
+  description = "A demo of services-flake usage without flake-parts";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    process-compose-flake.url = "github:Platonic-Systems/process-compose-flake";
+    services-flake.url = "github:juspay/services-flake";
+  };
+  outputs = inputs:
+    let
+      supportedSystems = [ "x86_64-linux" "aarch64-darwin" ];
+      forAllSystems = inputs.nixpkgs.lib.genAttrs supportedSystems;
+    in
+    {
+      packages = forAllSystems (system: (
+        let
+          pkgs = inputs.nixpkgs.legacyPackages.${system};
+        in
+        {
+          redis = (import inputs.process-compose-flake.lib { inherit pkgs; }).makeProcessCompose {
+            modules = [
+              inputs.services-flake.processComposeModules.default
+              {
+                services.redis."r1".enable = true;
+              }
+            ];
+          };
+        }
+      ));
+    };
+}

flake.nix

@@ -27,6 +27,10 @@
         };
         dir = "./example/share-services/pgweb";
       };
+      without-flake-parts-example = {
+        inherit overrideInputs;
+        dir = "./example/without-flake-parts";
+      };
       test = {
         inherit overrideInputs;
         dir = "./test";