Add a nix flake

.editorconfig

@@ -23,6 +23,10 @@ insert_final_newline = false
 charset = utf-8
 trim_trailing_whitespace = true
 
+[*.nix]
+charset = utf-8
+indent_size = 2
+
 [.gitignore]
 end_of_line = lf
 insert_final_newline = false

.gitignore

@@ -11,4 +11,7 @@ Cargo.lock
 
 # Local testdrive environments, mainly for development
 testdrive/custom
-testdrive/assert
+testdrive/assert
+
+# Nix build results
+result

flake.nix

@@ -0,0 +1,24 @@
+{
+  inputs = {
+    crane.url = "github:ipetkov/crane";
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    self,
+    crane,
+    utils,
+    ...
+  }: let
+    supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux"];
+  in
+    utils.lib.eachSystem supportedSystems
+    (
+      system: {
+        packages.oura = crane.lib.${system}.buildPackage {
+          src = self;
+        };
+        packages.default = self.packages.${system}.oura;
+      }
+    );
+}