Add CDK configuration for maintainance stacks to experimental deployment

[addis-samtek]

Deploy Maintenance API to Ephemeral Environment

Resolves #EREGCSC-2861

Description

This pull request changes:

• Implements automated deployment of Maintenance API to ephemeral environments for PR testing
• Adds GitHub Actions workflow for PR-specific stack deployment
• Matches exact configuration from existing serverless deployment:
  • Lambda: Python 3.12, 1024MB, 30s timeout
  • API Gateway: Edge endpoint with binary media types
  • IAM: Correct paths and permission boundaries
  • Logging: Proper CloudWatch configuration

Steps to manually verify this change:

1. Open a new PR

   • Verify GitHub Action triggers automatically
   • Check CDK deployment logs show correct configurations

2. Test deployed endpoint

   • Find API Gateway URL aws console
   • Verify maintenance API responds correctly
   • Check AWS Console for PR-specific resources (format: cms-eregs-eph-{pr-number}-maintenance-api)

3. Close PR to verify cleanup

   • Observe cleanup workflow trigger
   • Verify stack is destroyed
   • Check AWS Console to confirm resource removal

Comments

1. Resource naming pattern: cms-eregs-eph-{pr-number}-maintenance-api
2. Matches exactly: memory, timeout, runtime, IAM settings from serverless
3. Ephemeral resources auto-destroy on PR close/merge

[github-actions]

✨ See the Django Site in action ✨

[github-actions]

✨ See the Django Site in action ✨

[github-actions]

✨ See the Django Site in action ✨

[cgodwin1]

LGTM