Deck-chores

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* *removed*: the environment variable ``ASSERT_HOSTNAME`` is ignored to reflect changes in Docker's
TLS handling

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* *removed*: the environment variable ``SSL_VERSION`` has no effect and is marked as deprecated

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* *new*: the ``STDERR_LEVEL`` environment variable can define log levels whose messages are then
dumped to stderr instead of stdout
* *new*: the environment variable ``JOB_NAME_REGEX`` can be used to define patterns that job names
must match

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* *new*: maintenance release automation

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This release candidate for the final version brings improved documentation, logging, a lot of code
cleanup and these notable changes:

* *new*: jobs' container assignments and states are properly adjusted with regards to other
instances of a service's state
* *new*: ``deck-chores``' cache sizes for container properties can be controlled with
``CONTAINER_CACHE_SIZE``
* *new*: the environment variable ``JOB_POOL_SIZE`` can be used to adapt the job executors pool size
* *new*: images are build for ``arm64`` (aka ``aarch64``) architectures

All previously deprecated options have been removed.

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* *fix*: relax interpreter constraint for installations on rtfd.io