fix: add continue-on-error to health check step for proper rollback

The health check step was missing continue-on-error: true, which means
if it failed, the workflow would stop immediately and rollback steps
would not execute.

With this fix:
- Health check failures are properly captured in step.outcome
- Rollback steps can execute when health check fails
- Report Deployment Status can properly detect and report failures
- Overall workflow failure reporting works correctly

This ensures the error handling chain works as designed:
deploy (continue-on-error) -> health (continue-on-error) ->
rollback (if needed) -> report status (exit 1 on failure)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: owine

.github/workflows/deploy.yml

@@ -518,6 +518,7 @@ jobs:
       - name: Health Check All Services
         id: health
         if: steps.backup.outputs.deployment_needed == 'true' && steps.deploy.outcome == 'success'
+        continue-on-error: true
         run: |
           ./.compose-workflow/scripts/deployment/health-check.sh \
             --stacks "${{ join(fromJSON(inputs.stacks), ' ') }}" \