Django-iam-dbauth

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- Only enable the IAM token generation when the db option `use_iam_auth`
is set.

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- add precommit
- remove breakpoint

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- Fix KeyError when no password was set

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- Remove default ca-central-1 region name for boto3

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- Add support for MySQL via AWS RDS
- Add support for defining custom AWS RDS region name
- Add Github actions workflows
- Run tests against Python 3.8 and Django 3.1 as well

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- Fix github actions release workflow