discourse: serve stylesheets and repair the update (#17697)

nginx passed X-Accel-Mapping on every request. Stylesheets are sent
from tmp/, outside that mapping, so Rack redirected nginx to their
filesystem path and the page loaded without CSS. Existing installs get
the line removed on update.

The update called yarn, which is not installed, ran Rails without the
production environment or rbenv on PATH, asked for PostgreSQL 16 on a
17 install and left sidekiq running.

ct/discourse.sh

@@ -36,28 +36,35 @@ function update_script() {
     exit
   fi
 
-  msg_info "Stopping Service"
-  systemctl stop discourse
-  msg_ok "Stopped Service"
+  if grep -q 'X-Accel-Mapping' /etc/nginx/sites-available/discourse 2>/dev/null; then
+    msg_info "Fixing stylesheet delivery in Nginx"
+    sed -i '/X-Accel-Mapping/d' /etc/nginx/sites-available/discourse
+    $STD systemctl reload nginx
+    msg_ok "Fixed stylesheet delivery in Nginx"
+  fi
 
-  create_backup /opt/discourse/.env
+  msg_info "Stopping Services"
+  systemctl stop discourse discourse-sidekiq
+  msg_ok "Stopped Services"
 
   msg_info "Updating Discourse"
-  PG_VERSION="16" PG_MODULES="pgvector" setup_postgresql
   cd /opt/discourse
-  git pull origin main
-  $STD bundle install --deployment --without test development
-  $STD yarn install
+  export PATH="$HOME/.rbenv/bin:$HOME/.rbenv/shims:$PATH"
+  export COREPACK_ENABLE_DOWNLOAD_PROMPT=0
+  set -a
+  source /opt/discourse/.env
+  set +a
+  $STD git pull origin main
+  $STD bundle install
+  $STD pnpm install
   $STD runuser -u postgres -- psql -d discourse -c "CREATE EXTENSION IF NOT EXISTS vector;"
-  $STD bundle exec rails assets:precompile
   $STD bundle exec rails db:migrate
+  $STD bundle exec rails assets:precompile
   msg_ok "Updated Discourse"
 
-    restore_backup
-
-  msg_info "Starting Service"
-  systemctl start discourse
-  msg_ok "Started Service"
+  msg_info "Starting Services"
+  systemctl start discourse discourse-sidekiq
+  msg_ok "Started Services"
   msg_ok "Updated successfully!"
   exit
 }

install/discourse-install.sh

@@ -203,7 +203,6 @@ server {
     proxy_set_header X-Real-IP \$remote_addr;
     proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
     proxy_set_header X-Forwarded-Proto \$scheme;
-    proxy_set_header X-Accel-Mapping /opt/discourse/public/=/downloads/;
   }
 }
 EOF