Promote to Prod

Make target: p2p-promote-to-prod

After successful run of p2p-extended the version is ready for production deployment.

The default implementation as provided by software templates rarely needs changing:

p2p-promote-to-prod:
    corectl p2p promote <app-name>:${VERSION} \
        --source-stage $(EXTENDED_TEST_PATH) \
        --dest-registry $(REGISTRY) \
        --dest-stage $(PROD_PATH)

This moves the immutable versioned artifact into the registry for production and will be picked up next time prod deploy runs.