add flake

flake.nix

@@ -0,0 +1,89 @@
+{
+  description = "Go development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+    flake-utils.url = "github:numtide/flake-utils";
+    unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
+    kardinal.url = "github:kurtosis-tech/kardinal/4be70324e7b2";
+  };
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    unstable,
+    kardinal,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem
+    (
+      system: let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [
+            (final: prev: {
+              kardinal = kardinal.outputs.packages.${system};
+            })
+          ];
+        };
+      in {
+        devShells.default = let
+          start-local-cluster = pkgs.writeShellApplication {
+            name = "start-local-cluster";
+            runtimeInputs = with pkgs; [minikube istioctl kubectl];
+            text = ''
+              kubectl config set-context minikube
+              minikube start --driver=docker
+              minikube addons enable ingress
+              minikube addons enable metrics-server
+
+              istioctl install --set profile=minimal --set meshConfig.accessLogFile=/dev/stdout -y
+
+              kubectl apply -f https://github.com/kubernetes-sigs/gateway-api/releases/download/v1.1.0/standard-install.yaml
+
+              kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.10/samples/addons/prometheus.yaml
+              kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.10/samples/addons/grafana.yaml
+              kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.10/samples/addons/jaeger.yaml
+              kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.10/samples/addons/kiali.yaml
+              kubectl rollout status deployment/kiali -n istio-system
+            '';
+          };
+
+          kardinal-cli = pkgs.stdenv.mkDerivation {
+            name = "kardinal";
+            dontUnpack = true;
+            buildInputs = [pkgs.kardinal.kardinal-cli];
+            installPhase = ''
+              mkdir -p $out/bin
+              ln -s ${pkgs.kardinal.kardinal-cli}/bin/kardinal.cli $out/bin/kardinal
+            '';
+          };
+        in
+          pkgs.mkShell {
+            buildInputs = with pkgs; [
+              go
+              gopls
+              go-tools
+              golangci-lint
+              reflex
+
+              # local demo tools
+              kardinal-cli
+              minikube
+              kubectl
+              istioctl
+              telepresence2
+
+              # Scripts
+              start-local-cluster
+            ];
+
+            shellHook = ''
+              source <(kardinal completion bash)
+              echo "Go development environment loaded"
+              go version
+            '';
+          };
+      }
+    );
+}