Update devcontainer for Go and cloud tooling

Switch base image to the Go 1.25 Bookworm devcontainer and rework container tooling installs. Remove explicit apt/pip installs from the old image and instead remove the expired Yarn repo key, install Azure CLI, Helm, kubectl, Argo CD CLI, and Google Cloud SDK (including GKE auth plugin). Update devcontainer metadata: change container name, add --privileged to runArgs, and refresh the VS Code extensions list to include Go/Helm/AKS/Azure tooling and Copilot.

.devcontainer/Dockerfile

@@ -1,27 +1,28 @@
-FROM mcr.microsoft.com/devcontainers/base:bookworm
+FROM mcr.microsoft.com/devcontainers/go:1.25-bookworm
 
-# Install common CLI tooling for Helm chart development and validation.
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends \
-    ca-certificates \
-    curl \
-    git \
-    jq \
-    python3 \
-    python3-pip \
-    shellcheck \
-    yq \
-    && rm -rf /var/lib/apt/lists/*
+# Remove expired Yarn GPG key from base image
+RUN sudo rm -f /etc/apt/sources.list.d/yarn.list
 
-# Install the latest Helm 3 release.
-RUN curl -fsSL https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
+# Remove expired Yarn repository key (inherited from base image)
+RUN sudo rm -f /etc/apt/sources.list.d/yarn.list
 
-# Install the latest stable kubectl release.
-RUN KUBECTL_VERSION="$(curl -fsSL https://dl.k8s.io/release/stable.txt)" \
-    && curl -fsSL "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl" -o /usr/local/bin/kubectl \
-    && chmod +x /usr/local/bin/kubectl
+# Install AZURE CLI
+RUN curl -sL https://aka.ms/InstallAzureCLIDeb | sudo bash
 
-# Install YAML linter via pip (available as yamllint command).
-RUN pip3 install --no-cache-dir yamllint
+# Install helm and kubectl
+RUN curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash
+RUN curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" \
+    && chmod +x ./kubectl \
+    && sudo mv ./kubectl /usr/local/bin/kubectl
 
-USER vscode
+# Install Argocd CLI
+RUN VERSION=$(curl -L -s https://raw.githubusercontent.com/argoproj/argo-cd/stable/VERSION)
+RUN curl -sSL -o argocd-linux-amd64 https://github.com/argoproj/argo-cd/releases/download/v$VERSION/argocd-linux-amd64
+RUN sudo install -m 555 argocd-linux-amd64 /usr/local/bin/argocd
+RUN rm argocd-linux-amd64
+
+# Install google-cloud-sdk
+RUN echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] http://packages.cloud.google.com/apt cloud-sdk main" | sudo tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
+RUN curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo gpg --dearmor -o /usr/share/keyrings/cloud.google.gpg
+RUN sudo apt-get update && sudo apt-get install -y google-cloud-cli
+RUN sudo apt-get install google-cloud-cli-gke-gcloud-auth-plugin

.devcontainer/devcontainer.json

@@ -1,22 +1,23 @@
 {
-  "name": "helm-charts-bookworm",
-  "runArgs": [
-    "--name=kerberos-helm-charts",
-    "--network=host"
-  ],
-  "dockerFile": "Dockerfile",
-  "mounts": [
-    "source=/var/run/docker.sock,target=/var/run/docker.sock,type=bind"
-  ],
-  "customizations": {
-    "vscode": {
-      "extensions": [
-        "GitHub.copilot",
-        "ms-azuretools.vscode-docker",
-        "ms-kubernetes-tools.vscode-kubernetes-tools",
-        "redhat.vscode-yaml"
-      ]
-    }
-  },
-  "postCreateCommand": "helm version && kubectl version --client && yamllint --version"
+	"name": "go:1.25-bookworm",
+	"dockerFile": "Dockerfile",
+	"runArgs": [
+		"--name=helm-charts",
+		"--network=host",
+		 "--privileged"
+	],
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-kubernetes-tools.vscode-kubernetes-tools",
+				"redhat.vscode-yaml",
+				"Tim-Koehler.helm-intellisense",
+				"ms-vscode.azurecli",
+				"ms-vscode-remote.remote-containers",
+				"GitHub.copilot",
+				"ms-kubernetes-tools.vscode-aks-tools",
+				"fabiospampinato.vscode-diff"
+			]
+		}
+	}
 }