Zocalo

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* Add Dockerfile and build-and-push-docker-image GitHub workflow
* Add ``zocalo.pickup`` command for re-submitting messages stored in the ``zocalo.go.fallback_location`` while the message broker is unavailable

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* Add dispatcher service
* Add support for Python 3.11

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* ``JSONLines`` service: trigger ``process_messages`` immediately when reaching 100 stored messages

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* Add ``JSONLines`` service for appending messages to a file in jsonlines format

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* ``zocalo.configure_rabbitmq`` cli: downgrade "No matching queue found" error to warning

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* ``zocalo.configure_rabbitmq`` cli: additional debugging output in event of rare ``IndexError``