Add support for config templating.

[robholland]

Description & motivation 💭

This is to replace our use of dockerize in our docker containers. Using built-in templating will avoid the need to write to the filesystem, improving the security of our images by allowing read-only mounting.

Screenshots (if applicable) 📸

Design Considerations 🎨

Testing 🧪

How was this tested 👻

• [ ] Manual testing
• [ ] E2E tests added
• [ ] Unit tests added

Steps for others to test: 🚶🏽‍♂️🚶🏽‍♀️

Checklists

Draft Checklist

Merge Checklist

Issue(s) closed

Docs

Any docs updates needed?