新增 Service：k3d

Service%EF%BC%9Ak3d.md

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+# 安裝 kubectl & k3d
+
+```bash
+apt update \
+&& apt install -y curl \
+&& wget "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" -O /usr/local/bin/kubectl \
+&& chmod +x /usr/local/bin/kubectl \
+&& curl -s https://raw.githubusercontent.com/k3d-io/k3d/main/install.sh | bash
+```
+
+# 建立 1 個伺服器 2 個代理
+
+```bash
+k3d cluster create ct \
+--servers 1 \
+--agents 2 \
+--port 80:80@loadbalancer \
+--port 443:443@loadbalancer \
+--k3s-arg '--kubelet-arg=feature-gates=KubeletInUserNamespace=true@server:*' \
+--k3s-arg '--kubelet-arg=feature-gates=KubeletInUserNamespace=true@agent:*' \
+--volume /var/run/docker.sock:/var/run/docker.sock \
+--registry-create k3d-ct-registry:5000
+```
+
+# 驗證節點
+
+```bash
+kubectl get nodes
+```