feat: Add kubectl feature

[Roemer]

No description provided.

[Copilot]

Pull request overview

This PR adds a new kubectl devcontainer feature that installs kubectl and related Kubernetes tools (kubectx, kubens, k9s, helm, kustomize, kubeconform, kube-score, and fzf). It also updates dependencies and adds GitHub API token support for handling rate limits when fetching version information.

Changes:

• Adds kubectl feature with support for installing multiple Kubernetes-related tools
• Implements GitHub API token authentication to mitigate API rate limiting
• Updates Go dependencies and consolidates build task definitions

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
features/src/kubectl/devcontainer-feature.json	Defines feature metadata and configuration options for kubectl and related tools
features/src/kubectl/install.sh	Shell script entry point for installing kubectl feature
features/src/kubectl/installer.go	Go implementation for downloading and installing kubectl tools
features/test/kubectl/test-images.json	Test container images for kubectl feature
features/test/kubectl/scenarios.json	Test scenarios configuration
features/test/kubectl/install.sh	Test script for basic installation scenario
features/test/kubectl/full.sh	Test script for full installation with all tools
installer/github.go	Adds GitHub API token support via DEV_FEATURE_TOKEN_GITHUB_API environment variable
override-all.env	Adds override environment variables for kubectl download URLs
build/build.go	Adds kubectl build tasks and consolidates task definitions
go.mod / go.sum	Updates Go version and dependencies
README.md	Adds documentation for API tokens and development workflows
.github/workflows/ci.yml	Adds kubectl to CI test matrix

[Copilot]

Pull request overview

Copilot reviewed 13 out of 14 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

features/src/kubectl/installer.go:1

• The variable names semVerRegex and threeDigitRegex are inconsistent. The first uses 'Regex' while the second uses 'Regex'. However, 'threeDigitRegex' is somewhat misleading as it actually matches 2-3 digits (2 or 3 numeric parts), not specifically three digits. Consider renaming to 'twoOrThreeDigitRegex' or 'standardVersionRegex' for clarity.

package main