patch: Workflow to call airflow

[Gu1nness]

🏷️ Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tooling and CI
• Dependencies upgrade or change
• Chores / refactoring

📝 Description

Workflow that calls the Airflow DAG.
Expects inputs for all 4 charms in the shape of a json document containing mapping of architectures to documents

🧪 Manual testing steps

Using act to test the workflow (it will fail during the curl, but you can check the values and that everything is filled properly.

1. echo '{
    "inputs": {
        "mongodb": "{\"amd64\": \"117\", \"arm64\": \"118\"}",
        "mongos": "{\"amd64\": \"119\", \"arm64\": \"120\"}",
        "mongodb-k8s": "{\"amd64\": \"121\", \"arm64\": \"122\"}",
        "mongos-k8s": "{\"amd64\": \"123\", \"arm64\": \"124\"}"
    }
}' > payload.json
2. gh act -W '.github/workflows/promote.yaml' workflow_dispatch -e payload.json

🔬 Automated testing steps

✅ Checklist

• My code follows the code style of this project.
• I have added or updated any relevant documentation.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[Mehdi-Bendriss]

Thanks Neha!