Add TLS certs/keys from Env Vars

[hardillb]

fixes #5357

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)

Proposed changes

This allows certificates/keys to be loaded from Environment Variables rather than specifying local files (on the backend) or uploading files to the editor

Checklist

• [x] I have read the contribution guidelines
• [ ] For non-bugfix PRs, I have discussed this change on the forum/slack team.
• [ ] I have run npm run test to verify the unit tests pass
• [ ] I have added suitable unit tests to cover the new/changed functionality

[dceejay]

I think just move the local files checkbox below the other select (with Env option) - and then you can use the env selection to hide the checkbox line as appropriate.

[hardillb]

@dceejay done

[dceejay]

Yes - much better - that works for me.