[nominatim-web] Fix pip install invocation

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 89e6c9061983bc907066bcdb0d8ee82440765943
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Sun Feb 6 16:44:55 2022 +0100

    Fix pip install invocation

 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index ba6fdee..a59cc8e 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 -r fastapi uvicorn redis hiredis psycopg2 requests
+    /venv/bin/pip install fastapi uvicorn redis hiredis psycopg2 requests
 
 FROM python:3.10-slim