feat: add web.codexeditor.app and preview.codexeditor.app hostnames

[andrewhertog]

Summary

• Add web.codexeditor.app and preview.codexeditor.app to all HTTPRoute configurations
• Update workspace URL generation to use preview.codexeditor.app as the default hostname
• Maintain backward compatibility with existing hosts (test.denhertog.ca and loadbalancer.frontierrnd.com)
• Configure CI/CD workflows to test on PRs but only deploy on merge to main

Changes

Hostname Configuration

• Frontend HTTPRoute (frontend/k8s/k8s-ingress.yaml): Added new hostnames to accept frontend traffic
• Backend API HTTPRoute (backend/backend-deployment.yaml): Added new hostnames to accept API traffic
• Kubernetes Service (backend/src/services/kubernetesService.ts): Updated default hostnames for dynamically created workspace HTTPRoutes
• Workspace Creation (backend/src/routes/workspaces.ts): Changed workspace URL generation to use preview.codexeditor.app

Workflow Updates

• Backend Workflow (.github/workflows/backend.yaml): Test on PRs, deploy only on merge to main
• Frontend Workflow (.github/workflows/frontend.yaml): Test on PRs, deploy only on merge to main

Impact

• All existing deployments/statefulsets will accept traffic from four hosts after deployment
• Newly created workspaces will have URLs like https://preview.codexeditor.app/{namespace}/{workspace-name}
• Existing workspaces retain their stored URLs (no database migration required)
• CI/CD will run tests on this PR but skip Docker builds and deployments
• Deployments will only occur when this PR is merged to main

Test plan

• Verify CI/CD tests run successfully on this PR (without deploying)
• Merge PR and verify workflows run with deployment
• Deploy updated Kubernetes manifests: kubectl apply -f frontend/k8s/k8s-ingress.yaml and kubectl apply -f backend/backend-deployment.yaml
• Verify frontend is accessible via all four hostnames
• Verify backend API is accessible via all four hostnames
• Create a new workspace and verify the URL uses preview.codexeditor.app
• Test workspace access via the new URL
• Verify existing workspaces continue to work with their original URLs

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