Clean up this repo

aws/lambda-function/monitoring_example/scripts/validate-env.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -o errexit  # always exit on error
+set -o errtrace # trap errors in functions as well
+set -o pipefail # don't ignore exit codes when piping output
+set -o posix    # more strict failures in subshells
+
+IFS=$'\n\t'
+
+declare -a missing
+for var in "$@"; do
+  if [[ -z "${!var}" ]]; then
+    echo "⚠️ ERROR: Missing required environment variable: ${var}" 1>&2
+    missing+=("${var}")
+  fi
+done
+if [[ -n "${missing[*]}" ]]; then
+  exit 1
+fi