fix: set HOME=/root for rbenv installs to prevent path mismatch

When running in certain LXC environments (e.g. systems with desktop
packages or non-en locales), the HOME variable may resolve to '/'
instead of '/root'. rbenv installs to $HOME/.rbenv, so if HOME is
wrong it ends up in /.rbenv while all service files and PATH exports
hardcode /root/.rbenv, causing 'env: ruby: No such file or directory'.

Explicitly set HOME=/root for all setup_ruby calls that run as root,
and replace all $HOME/.rbenv references in PATH exports and install
steps with /root/.rbenv literals.

Affected scripts:
- ct/sure.sh + install/sure-install.sh (fixes #14479)
- ct/dawarich.sh + install/dawarich-install.sh
- ct/docuseal.sh + install/docuseal-install.sh

Also add TimeoutStartSec=300 to sure.service so db:prepare on first
start does not get killed by the default 90s systemd timeout.

install/sure-install.sh

@@ -26,7 +26,7 @@ fetch_and_deploy_gh_release "Sure" "we-promise/sure" "tarball" "latest" "/opt/su
 
 PG_VERSION="$(sed -n '/postgres:/s/[^[:digit:]]*//p' /opt/sure/compose.example.yml)" setup_postgresql
 PG_DB_NAME=sure_production PG_DB_USER=sure_user setup_postgresql_db
-RUBY_VERSION="$(cat /opt/sure/.ruby-version)" RUBY_INSTALL_RAILS=false setup_ruby
+RUBY_VERSION="$(cat /opt/sure/.ruby-version)" RUBY_INSTALL_RAILS=false HOME=/root setup_ruby
 
 msg_info "Building Sure"
 cd /opt/sure
@@ -73,6 +73,7 @@ ExecStartPre=/opt/sure/bin/rails db:prepare
 ExecStart=/opt/sure/bin/rails server
 Restart=always
 RestartSec=5
+TimeoutStartSec=300
 StandardOutput=journal
 StandardError=journal