'Add new script' (#4766)

Co-authored-by: push-app-to-main[bot] <203845782+push-app-to-main[bot]@users.noreply.github.com>

install/backrest-install.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2021-2025 community-scripts ORG
+# Author: ksad (enirys31)
+# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
+# Source: https://garethgeorge.github.io/backrest/
+
+source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
+color
+verb_ip6
+catch_errors
+setting_up_container
+network_check
+update_os
+
+msg_info "Installing Backrest"
+RELEASE=$(curl -fsSL https://api.github.com/repos/garethgeorge/backrest/releases/latest | grep "tag_name" | awk '{print substr($2, 3, length($2)-4) }')
+temp_file=$(mktemp)
+mkdir -p /opt/backrest/{bin,config,data}
+curl -fsSL "https://github.com/garethgeorge/backrest/releases/download/v${RELEASE}/backrest_Linux_x86_64.tar.gz" -o "$temp_file"
+tar xzf $temp_file -C /opt/backrest/bin
+chmod +x /opt/backrest/bin/backrest
+echo "${RELEASE}" >/opt/${APPLICATION}_version.txt
+msg_ok "Installed Backrest"
+
+msg_info "Creating Service"
+cat <<EOF >/etc/systemd/system/backrest.service
+[Unit]
+Description=Backrest
+After=network.target
+
+[Service]
+Type=simple
+User=root
+ExecStart=/opt/backrest/bin/backrest
+Environment="BACKREST_PORT=9898"
+Environment="BACKREST_CONFIG=/opt/backrest/config/config.json"
+Environment="BACKREST_DATA=/opt/backrest/data"
+Environment="XDG_CACHE_HOME=/opt/backrest/cache"
+
+[Install]
+WantedBy=multi-user.target
+EOF
+systemctl enable -q --now backrest
+msg_ok "Created Service"
+
+motd_ssh
+customize
+
+msg_info "Cleaning up"
+rm -f "$temp_file"
+$STD apt-get -y autoremove
+$STD apt-get -y autoclean
+msg_ok "Cleaned"