Fix /rebuild command workflow dispatch path for PR builds

[Copilot]

command-handler was failing when processing /rebuild comments because it dispatched a workflow that is not manually dispatchable. This updates the dispatch target and aligns the target workflow’s trigger/input contract so comment-driven rebuilds execute successfully.

• Workflow dispatch target correction

  • Updated pr-commands.yml to dispatch pr-build.yml instead of android.yml.

• Dispatch contract added to PR build workflow

  • Added workflow_dispatch to pr-build.yml with required pr_number input.
  • Preserves existing pull_request behavior.

• Event-agnostic PR number resolution

  • Updated artifact naming and metadata output to use:
    • github.event.inputs.pr_number || github.event.pull_request.number
  • Ensures consistent behavior for both comment-triggered rebuilds and normal PR runs.

# .github/workflows/pr-build.yml
on:
  pull_request:
    branches: [ "main" ]
  workflow_dispatch:
    inputs:
      pr_number:
        description: "Pull request number"
        required: true
        type: string

# Shared PR number resolution
${{ github.event.inputs.pr_number || github.event.pull_request.number }}

[JoshAtticus]

looks good to me

thank you microsoft for free $2 in practically worthless copilot credits, I used 19.5 of them to change like 4 lines in my github workflow

[JoshAtticus]

and the best part is it didn't fix the issue