Fix infra-deploy summary step failing when no templates changed

[ ] && echo exits with code 1 when the condition is false, causing bash -e
to abort. Use an if/elif/else block instead so the step always exits cleanly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: micahwalter

.github/workflows/infra-deploy.yml

@@ -86,7 +86,9 @@ jobs:
 
           if [ "$MANUAL" = "workflow_dispatch" ]; then
             echo "Deploy mode: manual (workflow_dispatch) — both stacks deployed"
-          else
+          elif [ "$PRIMARY" = "true" ] || [ "$SECONDARY" = "true" ]; then
             [ "$PRIMARY" = "true" ]   && echo "Deployed: micahwalter-www (us-east-1)"
             [ "$SECONDARY" = "true" ] && echo "Deployed: micahwalter-www-secondary (us-east-2)"
+          else
+            echo "No infra templates changed — nothing deployed"
           fi