Small but important documentation change for secure S3 buckets

[svenakela]

Hello,

I've successfully setup CNPG on a cloud where security is high by default.
To be able to connect to the storage as an S3 bucket I had to add

  instanceSidecarConfiguration:
    env:
      - name: AWS_REQUEST_CHECKSUM_CALCULATION
        value: when_required
      - name: AWS_RESPONSE_CHECKSUM_VALIDATION
        value: when_required
      - name: AWS_DEFAULT_REGION
        value: europe-3

to the ObjectStore config. The Barman Cloud docs are referring to the checksum vars but not the region var, which made it working.
Is it worth adding to the docs? According to the cloud provider tech support it is common for newer versions of AWS libs to require the region being set, so it could affect other S3 compatible storages as well.