#!/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 \
        -i ~/.ssh/alpine_hosts \
        -o BatchMode=yes \
        -o StrictHostKeyChecking=accept-new \
        "$SSH_USER@$host" \
        'hostname'
done