Add script to start local kind cluster for Keel development

- Creates scripts/start-local-cluster.sh
- Uses kind (Kubernetes in Docker) for reliable local cluster
- Idempotent: safe to run multiple times
- Includes Docker check, kind installation, kubectl check
- Creates cluster 'keel-dev' with context 'kind-keel-dev'
- Prints instructions for running Keel with --no-incluster

Spec-Ref: helix-specs@142dc3cb:000165_prepare-a-script-to

scripts/start-local-cluster.sh

@@ -0,0 +1,155 @@
+#!/bin/bash
+set -euo pipefail
+
+# =============================================================================
+# start-local-cluster.sh
+# Creates a local Kubernetes cluster using kind for Keel development
+# Usage: ./scripts/start-local-cluster.sh
+# =============================================================================
+
+CLUSTER_NAME="keel-dev"
+KIND_VERSION="v0.20.0"
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+log_info() {
+    echo -e "${GREEN}[INFO]${NC} $1"
+}
+
+log_warn() {
+    echo -e "${YELLOW}[WARN]${NC} $1"
+}
+
+log_error() {
+    echo -e "${RED}[ERROR]${NC} $1"
+}
+
+# Check if Docker is installed and running
+check_docker() {
+    if ! command -v docker &> /dev/null; then
+        log_error "Docker is not installed. Please install Docker first."
+        exit 1
+    fi
+
+    if ! docker info &> /dev/null; then
+        log_error "Docker is not running. Please start Docker first."
+        exit 1
+    fi
+
+    log_info "Docker is installed and running"
+}
+
+# Install kind if not present
+install_kind() {
+    if command -v kind &> /dev/null; then
+        log_info "kind is already installed: $(kind version)"
+        return
+    fi
+
+    log_info "Installing kind ${KIND_VERSION}..."
+
+    # Detect OS and architecture
+    OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+    ARCH=$(uname -m)
+    case $ARCH in
+        x86_64) ARCH="amd64" ;;
+        aarch64|arm64) ARCH="arm64" ;;
+    esac
+
+    curl -Lo /tmp/kind "https://kind.sigs.k8s.io/dl/${KIND_VERSION}/kind-${OS}-${ARCH}"
+    chmod +x /tmp/kind
+    sudo mv /tmp/kind /usr/local/bin/kind
+
+    log_info "kind installed successfully"
+}
+
+# Check if kubectl is available
+check_kubectl() {
+    if ! command -v kubectl &> /dev/null; then
+        log_warn "kubectl is not installed. Installing..."
+
+        OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+        ARCH=$(uname -m)
+        case $ARCH in
+            x86_64) ARCH="amd64" ;;
+            aarch64|arm64) ARCH="arm64" ;;
+        esac
+
+        curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/${OS}/${ARCH}/kubectl"
+        chmod +x kubectl
+        sudo mv kubectl /usr/local/bin/kubectl
+    fi
+
+    log_info "kubectl is available: $(kubectl version --client --short 2>/dev/null || kubectl version --client)"
+}
+
+# Create cluster if it doesn't exist
+create_cluster() {
+    if kind get clusters 2>/dev/null | grep -q "^${CLUSTER_NAME}$"; then
+        log_info "Cluster '${CLUSTER_NAME}' already exists"
+        return
+    fi
+
+    log_info "Creating kind cluster '${CLUSTER_NAME}'..."
+    kind create cluster --name "${CLUSTER_NAME}"
+    log_info "Cluster created successfully"
+}
+
+# Verify cluster is working
+verify_cluster() {
+    log_info "Verifying cluster..."
+
+    # Set kubectl context
+    kubectl config use-context "kind-${CLUSTER_NAME}" &> /dev/null
+
+    # Wait for node to be ready
+    log_info "Waiting for node to be ready..."
+    kubectl wait --for=condition=Ready node --all --timeout=60s
+
+    echo ""
+    kubectl get nodes
+    echo ""
+}
+
+# Print usage instructions
+print_instructions() {
+    echo ""
+    echo "=============================================="
+    echo -e "${GREEN}✅ Local Kubernetes cluster is ready!${NC}"
+    echo "=============================================="
+    echo ""
+    echo "Cluster name: ${CLUSTER_NAME}"
+    echo "Context:      kind-${CLUSTER_NAME}"
+    echo ""
+    echo "To run Keel against this cluster:"
+    echo ""
+    echo "  cd cmd/keel && go build && ./keel --no-incluster"
+    echo ""
+    echo "  # Or use make:"
+    echo "  make run"
+    echo ""
+    echo "To delete the cluster when done:"
+    echo ""
+    echo "  kind delete cluster --name ${CLUSTER_NAME}"
+    echo ""
+}
+
+# Main
+main() {
+    echo ""
+    echo "🚀 Setting up local Kubernetes cluster for Keel development"
+    echo ""
+
+    check_docker
+    install_kind
+    check_kubectl
+    create_cluster
+    verify_cluster
+    print_instructions
+}
+
+main "$@"