fix(hermesagent): source /etc/default/hermes via setsid; drop inline env vars and HERMES_HOME

ct/hermesagent.sh

@@ -45,10 +45,10 @@ function update_script() {
   msg_ok "Stopped Services"
 
   msg_info "Updating ${APP}"
-  $STD env \
-    HOME=/home/hermes \
-    HERMES_HOME=/home/hermes/.hermes \
+  $STD setsid --wait bash -c '
+    set -a; source /etc/default/hermes; set +a
     /home/hermes/.local/bin/hermes update --yes
+  '
   chown -R hermes:hermes /home/hermes
   msg_ok "Updated ${APP}"