refactor: unify devcontainer templates under noble base image and upd…

[PabloZaiden]

This pull request standardizes all built-in devcontainer templates to use the Ubuntu noble base image with Docker-in-Docker, and replaces the previous Node.js/TypeScript and Bun templates with a unified typescript template that uses devcontainer features for Node.js and Bun. The changes also update tests and documentation to reflect these new templates and configurations.

Template standardization and unification:

• All built-in templates now use the mcr.microsoft.com/devcontainers/base:noble image as their base, with the Docker-in-Docker feature preinstalled. This replaces previous images based on Ubuntu 24.04, Debian bookworm, and Debian trixie.
• The separate node-typescript and bun templates are removed and replaced with a single typescript template that includes both Node.js and Bun via devcontainer features. [1] [2]
• The typescript template is now exposed in template summaries and is verified in tests.

Template implementation improvements:

• A new createTemplateDefinition helper function is introduced to generate template definitions consistently, including the correct base image and features.
• All templates now specify their devcontainer features using a standardized mechanism, making it easier to extend or modify templates in the future.

Test and documentation updates:

• Tests are updated to expect the new base image, feature configuration, and unified template structure. This includes updates to both core logic and example workspace tests. [1] [2] [3] [4]
• The README.md is updated to reflect the new set of built-in templates.…ate features

[Copilot]

Pull request overview

This PR standardizes all built-in devcontainer templates onto the Ubuntu noble base image with Docker-in-Docker, and replaces the prior Node.js/TypeScript and Bun templates with a single unified typescript template built via devcontainer features.

Changes:

• Introduces a createTemplateDefinition helper to generate consistent template definitions (base image + standardized features).
• Replaces node-typescript and bun with a unified typescript template that composes Node.js + Bun features.
• Updates tests and README to reflect the new templates, base image, and expected generated configs/output.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/templates.ts	Refactors template definitions to use a single noble base image + Docker-in-Docker and adds a helper for consistency; introduces unified typescript template.
tests/templates.test.ts	Updates template tests for noble base + feature-based typescript template and verifies all templates include Docker-in-Docker.
tests/examples.test.ts	Updates example-workspace expectations for template listing and generated config shape (image + features).
tests/examples.live.test.ts	Makes arise output assertion resilient to variable counts via regex.
tests/core.test.ts	Updates resolveWorkspaceConfig expectations to match feature-based template configs.
README.md	Updates the list of built-in templates to include typescript and remove the old templates.

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[Copilot]

BASE_IMAGE is set to mcr.microsoft.com/devcontainers/base:noble and pinnedReference is built from that tag plus major-version feature refs. Since tags/major refs are mutable, this makes the "pinnedReference" value non-reproducible and potentially misleading (it’s not actually pinned). Consider using a versioned image tag or digest for the base image (and more specific feature refs where possible), or rename/split the field so consumers don’t interpret it as a stable/pinned reference.

Suggested change

	const BASE_IMAGE = "mcr.microsoft.com/devcontainers/base:noble";
	const BASE_NAME = "noble";
	const DOCKER_IN_DOCKER_FEATURE = "ghcr.io/devcontainers/features/docker-in-docker:2";
	const DOTNET_FEATURE = "ghcr.io/devcontainers/features/dotnet:2";
	const GO_FEATURE = "ghcr.io/devcontainers/features/go:1";
	const JAVA_FEATURE = "ghcr.io/devcontainers/features/java:1";
	const NODE_FEATURE = "ghcr.io/devcontainers/features/node:1";
	const RUST_FEATURE = "ghcr.io/devcontainers/features/rust:1";
	const BUN_FEATURE = "ghcr.io/devcontainers-extra/features/bun:1";
	const UV_FEATURE = "ghcr.io/devcontainers-extra/features/uv:1";
	const BASE_IMAGE =
	"mcr.microsoft.com/devcontainers/base:noble@sha256:<REPLACE_WITH_PUBLISHED_BASE_IMAGE_DIGEST>";
	const BASE_NAME = "noble";
	const DOCKER_IN_DOCKER_FEATURE =
	"ghcr.io/devcontainers/features/docker-in-docker@sha256:<REPLACE_WITH_PUBLISHED_DOCKER_IN_DOCKER_DIGEST>";
	const DOTNET_FEATURE =
	"ghcr.io/devcontainers/features/dotnet@sha256:<REPLACE_WITH_PUBLISHED_DOTNET_DIGEST>";
	const GO_FEATURE =
	"ghcr.io/devcontainers/features/go@sha256:<REPLACE_WITH_PUBLISHED_GO_DIGEST>";
	const JAVA_FEATURE =
	"ghcr.io/devcontainers/features/java@sha256:<REPLACE_WITH_PUBLISHED_JAVA_DIGEST>";
	const NODE_FEATURE =
	"ghcr.io/devcontainers/features/node@sha256:<REPLACE_WITH_PUBLISHED_NODE_DIGEST>";
	const RUST_FEATURE =
	"ghcr.io/devcontainers/features/rust@sha256:<REPLACE_WITH_PUBLISHED_RUST_DIGEST>";
	const BUN_FEATURE =
	"ghcr.io/devcontainers-extra/features/bun@sha256:<REPLACE_WITH_PUBLISHED_BUN_DIGEST>";
	const UV_FEATURE =
	"ghcr.io/devcontainers-extra/features/uv@sha256:<REPLACE_WITH_PUBLISHED_UV_DIGEST>";