Tibanna

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* Add config option ``ami_per_region``.
* Bump ``cwltool`` version to ``3.1.20211103193132``.
* Singularity was not working. Also, bump Singularity version to ``3.10.4``.
* Speed up Tibanna docker build.
* Fix Goofys installation on ARM architecture.

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* Add CodeBuild specification.

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* Added support for Graviton instances.
* Removed ``other_instance_types`` as option for ``behavior_on_capacity_limit``. It will fall back to ``wait_and_retry``.
* Multiple instance types can be specified in the configuration. If ``spot_instance`` is enabled, Tibanna will run the workflow on the instance with the highest available capacity. If ``spot_instance`` is disabled, it will run the workflow on the cheapest instance in the list.
* Instead of using the ``run_instance`` command we switch to EC2 fleets (in instant mode) to start up instances.

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* Fixed bug where Tibanna would use and report and incorrect overall CPU utilization of the EC2 instance.