Remove sudo from ddev-dbserver or at least from a hardened version

[rfay]

Describe the bug

ddev-dbserver has sudo and uses it. A fair bit. And it has a writeable .ddev mount in /mnt/ddev_config, so a break-in might be able to use sudo to make a setuid file on the host.

It's unlikely that shell-access to the dbserver would be obtained, but it would sure be better if we could just get sudo off of here.

A related technique (leaving sudo here) would be to share only the .ddev/db_snapshots directory as writeable, and share the .ddev directory as read-only. Might be easier and better.

To Reproduce
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4. See error

Expected behavior
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Screenshots
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Version and configuration information (please complete the following information):

• Host computer OS and Version: [e.g. Windows 10, macOS Catalina]
• Docker Desktop version if on macOS or Windows (from "About Docker Desktop")
• ddev version information (use ddev version)
• config.yaml contents for the misbehaving project
• Do you have any custom configuration (nginx, php, mysql) in the .ddev folder? If so, have you tried without them?

Additional context
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