feat(deepspacecartel/kubernetes-devcontainer): Kubernetes workspaces built from a repo's devcontainer.json

[alexanderilyin]

Description

This adds the deepspacecartel namespace and its first template, Kubernetes (Dev Containers).

Users enter a git repository and a branch. devcontainer-builder builds the image from that repository's own devcontainer.json (base image, Features, Dockerfile) on a BuildKit daemon in the cluster. The workspace then runs it with the configuration's lifecycle commands, environment, mounts, forwarded ports and VS Code extensions/settings. It's GitHub Codespaces' workflow on your own Kubernetes cluster:

• Repos without a config get a generic image, and a VS Code extension offers to add a configuration.
• Rebuild prompt: the same extension offers a rebuild when the branch's Dev Container configuration changes.
• Private repositories work with each user's own linked account (external_auth_id).

The template is adapted from coder/kubernetes. It uses the deepspacecartel/devcontainer-builder Terraform provider and the registry's vscode-web and vscode-desktop modules. It needs devcontainer-builder and BuildKit running in the cluster (one Helm chart), as the README explains.

devcontainer-builder's 1.0 is being prepared. Screenshots will be added to this PR with its docs, and I'm opening it now so review can start early.

Type of Change

• New module
• New template
• Bug fix
• Feature/enhancement
• Documentation
• Other

Template Information

Path: registry/deepspacecartel/templates/kubernetes-devcontainer

Testing & Validation

• Tests pass (bun test). There are no TypeScript tests for templates.
• Code formatted: bun x prettier --check and terraform fmt -check are clean.
• Changes tested locally:
  • terraform validate passes;
  • go run ./cmd/readmevalidation validates the namespace and template READMEs;
  • this main.tf is the template devcontainer-builder ships (templates/coder-kubernetes), pushed with coder templates push and run on a Coder v2.37 deployment, including public and private repositories, rebuilds and repositories without a config.

Related Issues

None

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