feat(providers): add support for digitalocean

Description

Related Issue(s)

Fixes #41

How to test

Checklist

Thanks for this pull request. Please complete the checklist to get the change accepted quicker

Cloud provider modules only

• [ ] This change requires testing on a new cloud provider
• [ ] I am prepared to share my cloud provider credentials (this is required for the change to be accepted - see reasoning)
• [ ] My change follows the standard provider interface