enable caching in github actions and circle ci for docker builds

[chicco785]

Proposed changes

enable caching in github actions and circle ci for docker builds

Types of changes

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• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• [x] I have read the CONTRIBUTING doc
• [x] I have signed the CLA
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have run all the existing tests locally (not just those related to my feature) and there are no errors
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• [x] I have updated the RELEASE NOTES
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• [ ] Any dependent changes have been merged and published in downstream modules

Further comments

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[chicco785]

fixing the docker "latest" image to the actual last one, revealed that integration tests were not updated to be compliant with some of the changes introduced:

• service path must be none when calling the drop delete of an entity type
• servicePath = None is now assumed to be servicePath = '/'

[chicco785]

fix #626 fix #531 progress #447

[c0c0n3]

excellent work, thanks alot!