feat(cli): add features publish command

[skevetter]

Summary

• Implements the features publish command per the devcontainer specification
• Publishes packaged devcontainer features to OCI registries
• Follows existing OCI publishing patterns from templates publish
• Includes unit tests and e2e tests

Summary by CodeRabbit

• New Features
  • Added a publish command to package and push dev container features to OCI registries with support for custom registries and namespaces
  • Command outputs feature metadata including ID, version, and published reference in JSON format

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c6c69fa2-a514-4400-9cb7-e4aeb7eacf6b

📥 Commits

Reviewing files that changed from the base of the PR and between d074633 and c686aae.

📒 Files selected for processing (4)

• cmd/features/publish.go
• cmd/features/publish_test.go
• cmd/features/root.go
• e2e/tests/features/features_publish.go

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📝 Walkthrough

Walkthrough

Adds a features publish command that validates a dev container feature directory, builds a single-layer OCI image from its contents, and pushes it to a registry. The command resolves paths, parses metadata, constructs OCI references, authenticates via keychain, and outputs published feature details as JSON.

Changes

Publish Feature Command

Layer / File(s)	Summary
Command Definition & Flags cmd/features/publish.go	Defines PublishFlags struct. NewPublishCmd registers the cobra command with --target (required), --registry (default ghcr.io), and --namespace flags. Sets runPublish as the command handler.
Data Types & Output cmd/features/publish.go	publishedFeatureMetadata struct marshals the JSON output containing feature id, version, and published ref.
Publish Orchestration cmd/features/publish.go	runPublish orchestrates the end-to-end workflow: resolves and validates the target directory, parses feature metadata, derives version (default latest), builds the OCI reference, constructs the image, pushes to registry with keychain auth, and outputs JSON metadata to stdout.
Helper Functions cmd/features/publish.go	validatePublishTarget checks the target is a directory with valid devcontainer-feature.json containing a required id. buildPublishReference formats the OCI reference. parsePublishRef converts the reference string to a name.Reference. buildFeatureImage creates a single-layer OCI image from the directory contents.
Root Command Integration cmd/features/root.go	Registers the publish subcommand in the features root command.
Unit Tests cmd/features/publish_test.go	Tests command flag defaults and registration; validates --target required annotation; verifies reference formatting with/without namespace; tests validatePublishTarget error and success cases; validates image layer construction; and tests reference parsing.
End-to-End Tests e2e/tests/features/features_publish.go	Ginkgo suite with in-memory OCI registry server. Tests successful publish with/without namespace, default version assignment, error cases for missing targets and metadata, and JSON output verification. Includes createFeatureDir helper for test setup.

Sequence Diagram

sequenceDiagram
participant cmd as Publish Command
participant fs as File System
participant parser as Feature Parser
participant builder as Image Builder
participant registry as OCI Registry
cmd->>fs: Resolve & validate target directory
fs-->>cmd: Target path validated
cmd->>parser: Parse devcontainer-feature.json
parser-->>cmd: Feature config (id, version)
cmd->>cmd: Construct OCI reference
cmd->>builder: Build image from directory
builder-->>cmd: OCI image with tar layer
cmd->>registry: Authenticate & push image
registry-->>cmd: Publish successful
cmd->>cmd: Output JSON metadata

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title 'feat(cli): add features publish command' directly and clearly summarizes the main change: adding a new publish command for features.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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