👷 Bicep to deploy on Azure on SSW Tenant

[Hona]

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### Tasks
- [ ] Bicep template for app service
- [ ] Add secrets to GitHub secrets
- [ ] Consider using Key Vault

[bradystroud]

Deployed to production https://timesheet-gpt.azurewebsites.net/

[bradystroud]

To do all the IaC stuff, I need to add to GitHub secrets. I cant do this without admin access so will put this on hold for now. I've pushed a bit of work up on a branch https://github.com/SSWConsulting/TimesheetGPT/tree/iac