Add initial update.sh script to trigger installer.sh from box

src/scripts/update.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+set -eu -o pipefail
+
+if [[ ${EUID} -ne 0 ]]; then
+    echo "This script should be run as root." > /dev/stderr
+    exit 1
+fi
+
+readonly INSTALLER_SOURCE_DIR="/home/yellowtent/installer"
+readonly LOG_FILE="/var/log/cloudron-update.log"
+
+if [[ $# == 1 && "$1" == "--check" ]]; then
+    echo "OK"
+    exit 0
+fi
+
+if [[ $# != 2 ]]; then
+    echo "sourceTarballUrl and data arguments required"
+    exit 1
+fi
+
+readonly sourceTarballUrl="${1}"
+readonly data="${2}"
+
+echo " " &>> "${LOG_FILE}"
+echo "============ update marker ============" &>> "${LOG_FILE}"
+echo " " &>> "${LOG_FILE}"
+echo "Updating Cloudron with ${sourceTarballUrl}" &>> "${LOG_FILE}"
+echo "${data}" &>> "${LOG_FILE}"
+
+echo "=> Run installer.sh"
+if ! ${INSTALLER_SOURCE_DIR}/src/scripts/installer.sh --sourcetarballurl "${sourceTarballUrl}" --data "${data}" &>> "${LOG_FILE}"; then
+    echo "Failed to install cloudron. See ${LOG_FILE} for details"
+    exit 1
+fi