fix: handle missing ECS deployment gracefully when replaced (#20)

* feat: Handle missing ECS deployment gracefully when replaced by external redeploy

* feat: refine message

Author: Bankamah

deploy.sh

@@ -69,6 +69,13 @@ function pollForSpecificServiceUpdate() {
         while true; do
             RESPONSE=$(describeService)
             DEPLOYMENT=$(echo "$RESPONSE" | jq -r --arg deploymentId "$1" '.services[]?.deployments[] | select(.id==$deploymentId)')
+
+            if [ -z "$DEPLOYMENT" ]; then
+                echo -e "${ORANGE}Deployment with ID $1 was cancelled, missing or replaced by another.";
+                echo -e "${ORANGE}Exiting polling loop. Please verify deployment status in the AWS Console."
+                exit 0;
+            fi
+
             DESIRED_COUNT=$(echo "$DEPLOYMENT" | jq -r '.desiredCount // 0')
             RUNNING_COUNT=$(echo "$DEPLOYMENT" | jq -r '.runningCount // 0')
             PENDING_COUNT=$(echo "$DEPLOYMENT" | jq -r '.pendingCount // 0')