optimizing Dockerfile

Dockerfile

@@ -9,10 +9,11 @@ RUN apt-get update  \
     && apt-get install -y curl \
     && rm -rf /var/lib/apt/lists/*
 
-COPY ./app/* .
-
+COPY ./app/requirements.txt .
 RUN pip3 install -r requirements.txt
 
+COPY ./app/* .
+
 EXPOSE 8501
 
 HEALTHCHECK CMD curl --fail http://localhost:8501/_stcore/health