mt-release.yml: add allowStore* inputs to enable store channels on demand

[Copilot]

Adds allowStoreAlpha, allowStoreBetaPrivate, and allowStoreProduction boolean inputs (default false) to the mt-release.yml workflow — the complement to the existing skipStore* inputs.

Changes

• New inputs (workflow_dispatch): allowStoreAlpha, allowStoreBetaPrivate, allowStoreProduction — each boolean, default false
• New step MT allow store releases: runs before MT skip store releases, touches the corresponding config/store/{alpha,beta-private,production} file when the input is true
• Skip overrides allow: ordering is intentional — skip step executes after allow step, so skipStore* always wins

- name: MT allow store releases
  if: ${{ github.event.inputs.allowStoreAlpha == 'true' || github.event.inputs.allowStoreBetaPrivate == 'true' || github.event.inputs.allowStoreProduction == 'true' }}
  run: |
    mkdir -p config/store
    if [[ "${{ github.event.inputs.allowStoreAlpha }}" == "true" ]]; then
      touch config/store/alpha
    fi
    if [[ "${{ github.event.inputs.allowStoreBetaPrivate }}" == "true" ]]; then
      touch config/store/beta-private
    fi
    if [[ "${{ github.event.inputs.allowStoreProduction }}" == "true" ]]; then
      touch config/store/production
    fi

- name: MT skip store releases   # runs after — skip always overrides allow
  ...

[gemini-code-assist]

Code Review

This pull request introduces new workflow inputs to explicitly allow specific store releases (Alpha, Beta-Private, and Production) and adds a step to create the corresponding marker files in the config/store/ directory. A review comment suggests consolidating the 'allow' and 'skip' release logic into a single step to eliminate redundant file operations and improve the maintainability of the workflow.