Set private access for remote state storage container

[strickvl]

Not sure if it was intentional to set access to the remote state container with container_access_type as container. Seems like private would be a better setting. Terraform remote state contains lots and lots of plain-text secrets and so you don't want to enable any kind of public access.

Not sure about the downstream effects elsewhere inside Matcha from this change, but if I'm not mistaken the current setting might be risky from a security perspective.

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