[INF-3641] Include container failure reason in error messages

lib/renderer/states/tasks-failed.js

@@ -6,6 +6,20 @@ module.exports = function (deployment) {
   let extraMsg = "\nFailure Reasons\n";
   deployment.tasksFailedFull.forEach((task) => {
     extraMsg += `\nTask: ${task.taskArn}\nReason: ${task.stoppedReason}\n`
+
+    // The above stopped reason is often generic for the whole task, and doesn't
+    // give a lot of context about why an individual container stopped. So let's
+    // dig into the individual containers and print their own stopped reasons as well.
+    task.containers.forEach((container) => {
+      if (container.exitCode !== 0) {
+        extraMsg += `  Container: ${container.name} (${container.lastStatus})\n`
+        extraMsg += `    Exit code: ${container.exitCode}\n`
+
+        if (container.reason) {
+          extraMsg += `    Reason: ${container.reason}\n`
+        }
+      }
+    })
   });
 
   return {