Add nixci config to flake (#19)

flake.nix

@@ -6,5 +6,21 @@
       description = "Example flake using process-compose-flake";
       path = builtins.path { path = ./example; filter = path: _: baseNameOf path == "flake.nix"; };
     };
+
+    # Config for https://github.com/srid/nixci
+    # To run this, `nix run github:srid/nixci`
+    nixci = let overrideInputs = { "services-flake" = ./.; }; in {
+      example = {
+        inherit overrideInputs;
+        dir = "./example";
+      };
+      test = {
+        inherit overrideInputs;
+        dir = "./test";
+      };
+      dev = {
+        dir = "./dev";
+      };
+    };
   };
 }

test.sh

@@ -2,6 +2,8 @@ set -euxo pipefail
 
 cd "$(dirname "$0")"
 
+# TODO: Replace this with `nix run github:srid/nixci`
+
 # On NixOS, run the VM tests to test runtime behaviour
 if command -v nixos-rebuild &> /dev/null; then
   # example test