feat: expand copilot as a bot alias to all GitHub Copilot bot identities

[Copilot]

Users writing bots: [copilot] needed to know and enumerate all Copilot actor identities manually. This adds compile-time alias expansion so copilot covers the full set of GitHub Copilot bots — the coding agent (copilot-swe-agent[bot]), the interactive @Copilot bot, and the base copilot[bot] form.

Changes

• pkg/workflow/bot_aliases.go — new file defining copilotBotNames and expandBotNames, which replaces any "copilot" entry with the three canonical identities
• pkg/workflow/compiler_orchestrator_workflow.go — wraps both mergeBots and mergeSkipBots with expandBotNames so the alias works in both bots: and skip-bots:
• pkg/workflow/bot_aliases_test.go — unit tests for expandBotNames covering nil passthrough, deduplication, and mixed-list cases
• pkg/workflow/bots_test.go — end-to-end compilation test verifying bots: [copilot] produces GH_AW_ALLOWED_BOTS: "copilot-swe-agent,Copilot,copilot"

Example

on:
  pull_request:
    types: [opened]
  bots: [copilot]   # expands to: copilot-swe-agent, Copilot, copilot

Compiled output:

GH_AW_ALLOWED_BOTS: "copilot-swe-agent,Copilot,copilot"

Dedup-safe: explicitly listing copilot-swe-agent alongside copilot produces no duplicate entries.

[Copilot]

Pull request overview

Adds support for using copilot as a shorthand bot alias in workflow frontmatter so authors don’t need to enumerate all GitHub Copilot actor identities.

Changes:

• Introduces expandBotNames to expand "copilot" into copilot-swe-agent, Copilot, and copilot, with deduplication.
• Applies alias expansion during compilation for both on.bots and on.skip-bots.
• Adds unit + end-to-end tests for alias expansion behavior and compiled output.

Show a summary per file

File	Description
pkg/workflow/bot_aliases.go	Adds the copilot alias expansion helper and canonical Copilot bot name list.
pkg/workflow/compiler_orchestrator_workflow.go	Applies expandBotNames to merged bots and skip-bots during workflow extraction.
pkg/workflow/bot_aliases_test.go	Unit tests for expandBotNames (nil/empty passthrough, dedup, mixed lists).
pkg/workflow/bots_test.go	End-to-end compilation test asserting bots: [copilot] expands into GH_AW_ALLOWED_BOTS.
.github/workflows/release.lock.yml	Updates the pinned docker/metadata-action reference in the generated release lockfile.
.github/aw/actions-lock.json	Adds a new pinned entry for docker/metadata-action@v6.

Copilot's findings

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• Files reviewed: 6/6 changed files
• Comments generated: 2