Exit nginx bypass placeholder cleanly on SIGTERM (#16845)

docker/ha-addon-rootfs/etc/s6-overlay/s6-rc.d/nginx/run

@@ -6,11 +6,15 @@
 # ==============================================================================
 
 # The new device builder handles HA ingress itself, so nginx is bypassed.
-# Block the longrun forever so s6 keeps the dependency satisfied and does
-# not respawn it.
+# Block the longrun so s6 keeps the dependency satisfied, but exit 0 on
+# SIGTERM instead of being signal-killed; a 256/15 exit makes nginx/finish
+# stamp the container exit 143, which trips the Supervisor's SIGTERM check.
 if bashio::config.true 'use_new_device_builder'; then
     bashio::log.info "NGINX bypassed: new device builder serves ingress directly."
-    exec sleep infinity
+    trap 'exit 0' TERM
+    sleep infinity &
+    wait
+    exit 0
 fi
 
 bashio::log.info "Waiting for ESPHome dashboard to come up..."