[nominatim-web] Add line continuation

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit e52a196746cd1b78c16edad2ff93c2242dc1ad46
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Sun Feb 6 16:32:18 2022 +0100

    Add line continuation

 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index 926a1c4..9983868 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ RUN apt-get update && \
         build-essential libpq-dev
 
 RUN python -m venv /venv && \
-    /venv/bin/pip install fastapi unicorn requests redis hiredis psycopg2
+    /venv/bin/pip install fastapi unicorn requests redis hiredis psycopg2 && \
     && rm -f /requirements.txt
 
 FROM python:3.10-slim