Document manual workflow dispatch for LookML Validation Pipeline

[Copilot]

The LookML Validation Pipeline workflow already supports manual triggering via workflow_dispatch:, but this capability was undocumented.

Changes

• README.md: Added documentation for manual workflow triggering
  • Listed manual dispatch as a trigger event
  • Included step-by-step instructions for triggering from GitHub Actions UI
  • Documented use cases (re-running validation, testing specific branches, pre-PR validation)

Configuration

The workflow file already has the correct configuration:

# .github/workflows/lookml-validation.yml
on:
  workflow_dispatch:  # Enables manual triggering
  pull_request:
    branches: [ main, master, develop ]
  push:
    branches: [ main, master ]

The Spectacles Validation workflow (spectacles-validation.yml) intentionally lacks workflow_dispatch:, ensuring only the LookML Validation Pipeline can be manually triggered.

Original prompt

run the workflow manually to trigger only bi_sandbox/.github/workflows
/lookml-validation.yml file

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