Add check-host.sh

check-host.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+set -euo pipefail
+
+: "${TARGET_HOSTS:?TARGET_HOSTS is not configured}"
+: "${SSH_USER:?SSH_USER is not configured}"
+
+for host in $TARGET_HOSTS; do
+    echo "Connecting to $host..."
+
+    ssh \
+        -o BatchMode=yes \
+        -o StrictHostKeyChecking=accept-new \
+        "$SSH_USER@$host" \
+        'hostname'
+done