fix(grist): keep install:ee non-interactive (GIT_TERMINAL_PROMPT=0)

Restores the enterprise-extensions install step (install:ee) and stops it
hanging during "Installing Grist".

install:ee clones the private grist-ee repo and falls back to a public
prebuilt tarball when the clone fails. On a host with an attached terminal
and no signed-in GitHub user, git does not fail - it blocks on
"Username for 'https://github.com':", so the install hangs forever.
GIT_TERMINAL_PROMPT=0 makes the clone fail fast so the tarball fallback
runs as intended.

Refs community-scripts/ProxmoxVE#14782

install/grist-install.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2021-2026 community-scripts ORG
+# Author: cfurrow | Co-Author: Slaviša Arežina (tremor021)
+# License: MIT | https://github.com/community-scripts/ProxmoxVED/raw/main/LICENSE
+# Source: https://github.com/gristlabs/grist-core
+
+source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
+color
+verb_ip6
+catch_errors
+setting_up_container
+network_check
+update_os
+
+msg_info "Installing Dependencies"
+$STD apt install -y \
+  make \
+  ca-certificates \
+  python3-venv \
+  git
+msg_ok "Installed Dependencies"
+NODE_VERSION="22" NODE_MODULE="yarn@latest" setup_nodejs
+fetch_and_deploy_gh_release "grist" "gristlabs/grist-core" "tarball"
+
+msg_info "Installing Grist"
+export CYPRESS_INSTALL_BINARY=0
+export NODE_OPTIONS="--max-old-space-size=2048"
+# install:ee stalls probing the private grist-ee repo (a dev-only path it
+# tries before falling back to the public tarball); GIT_TERMINAL_PROMPT=0
+# makes that probe fail fast instead of waiting at a git login prompt.
+export GIT_TERMINAL_PROMPT=0
+cd /opt/grist
+$STD yarn install
+$STD yarn run install:ee -y
+$STD yarn run build:prod
+$STD yarn run install:python
+cat <<EOF >/opt/grist/.env
+NODE_ENV=production
+GRIST_HOST=0.0.0.0
+EOF
+msg_ok "Installed Grist"
+
+msg_info "Create Service"
+cat <<EOF >/etc/systemd/system/grist.service
+[Unit]
+Description=Grist
+After=network.target
+
+[Service]
+Type=simple
+WorkingDirectory=/opt/grist 
+ExecStart=/usr/bin/yarn run start:prod
+EnvironmentFile=-/opt/grist/.env
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl enable -q --now grist
+msg_ok "Created Service"
+
+motd_ssh
+customize
+cleanup_lxc