add support for devcontainer

.devcontainer/devcontainer.json

@@ -0,0 +1,26 @@
+// For format details, see https://containers.dev
+{
+    "name": "Kops environment from dev container",
+    // Image to pull when not building from scratch. See .devcontainer/build/devcontainer.json
+    // and .github/devcontainer-build-and-push.yml for the instructions on how this image is built
+    "image": "registry.k8s.io/build-image/kube-cross:v1.29.0-go1.21.3-bullseye.0",
+    // Setup the go environment and mount into the dev container at the expected location
+    "workspaceFolder": "/go/src/k8s.io/kops",
+    "workspaceMount": "source=${localWorkspaceFolder},target=/go/src/k8s.io/kops,type=bind,consistency=cached",
+    // Ensure that the host machine has enough resources to build and test Kops
+    "hostRequirements": {
+        "cpus": 4
+    },
+    // Copy over welcome message and install pyyaml
+    "onCreateCommand": "bash .devcontainer/setup.sh",
+    // for Kubernetes testing, suppress extraneous forwarding messages
+    "otherPortsAttributes": {
+        "onAutoForward": "silent"
+    },
+    "remoteUser": "root"
+    // Configure tool-specific properties.
+    // "customizations": {
+    // },
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+}

.devcontainer/setup.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+# Copyright 2023 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eux
+
+# Copies over welcome message
+cp .devcontainer/welcome-message.txt /usr/local/etc/vscode-dev-containers/first-run-notice.txt
+
+git remote add upstream https://github.com/kubernetes/kops.git
+# Never push to upstream master
+git remote set-url --push upstream no_push

.devcontainer/welcome-message.txt

@@ -0,0 +1,20 @@
+👋 Welcome to Kops contribution in a dev container!
+     Works in GitHub Codespaces, VS Code, or in docker using the devcontainer cli
+
+See https://kops.sigs.k8s.io/contributing/ for guidance on contributing to Kops
+
+This debian dev container image satisfies https://github.com/kubernetes/community/blob/master/contributors/devel/development.md and includes:
+ - kubernetes/kubernetes repository
+ - Docker
+ - go
+ - kubectl, etcd, kubetest2, and kind
+For details about dev containers and the debian dev container base image see https://containers.dev and https://github.com/devcontainers/images/tree/main/src/base-debian.
+The configuration for the dev container is in the .github/.devcontainer folder. (will be moved to prow)
+🎵 By default in Codespaces this environment uses a 4-core machine. Some tests may require a larger machine. In Codespaces you can change the machine type.
+   See https://docs.github.com/en/codespaces/customizing-your-codespace/changing-the-machine-type-for-your-codespace
+
+⚙️ If you are working in Codespaces on your own fork, this environment is automatically configured to support the GitHub
+   workflow https://www.kubernetes.dev/docs/guide/github-workflow/ (omit the clone step)
+↪️ Otherwise Codespaces will automatically fork the repository for you when you make your first push
+
+🔍 To explore VS Code to its fullest, search using the Command Palette (Cmd/Ctrl + Shift + P or F1).

.gitignore

@@ -24,7 +24,6 @@
 
 # Vscode files
 .vscode
-.devcontainer
 
 # Emacs save files
 *~