Add skipPublishRelease input to mt-release workflow

[Copilot]

mt-release.yml had no way to build APK/AAB artifacts without also triggering the GitHub and Play Store release. Adding skipPublishRelease enables dry-run builds.

Changes

• New input skipPublishRelease — boolean, default false; when true, skips MT Publish release, MT check screenshot age, and (transitively) MT trigger record screenshots workflow
• CLI example added — gh workflow run mt-release.yml -f skipPublishRelease=true

skipPublishRelease:
  description: 'Skip GitHub & all Play Store release (useful to generate APK/AAB)'
  type: boolean
  default: false
  required: false

Steps conditioned on the flag:

- name: MT Publish release
  if: ${{ github.event.inputs.skipPublishRelease != 'true' }}

- name: MT check screenshot age
  if: ${{ github.event.inputs.skipPublishRelease != 'true' }}

[gemini-code-assist]

Code Review

This pull request introduces a skipPublishRelease input parameter to the mt-release.yml workflow, allowing the 'MT Publish release' and 'MT check screenshot age' steps to be skipped when only build artifacts are required. I have no feedback to provide.