(service): Add CDK Build & Deploy steps to GitHub Actions

[ReidWeb]

As described

Use Case

As a developer of the API i should be able to have my changes built and automatically deployed to non-prod on the back of commits to the repo.

Proposed Solution

• CDK build should occur in CI
• CDK deploy should occur to non-prod env
• Ability to promote to prod env
• Should only occur upon changes to CDK or service directories.

Other

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

---

This is a 🚀 Feature Request