Fix dockerfile

Author: PythonCoderAS

Dockerfile

@@ -4,6 +4,7 @@ FROM python:3.12-alpine as generate-requirements
 WORKDIR /app
 
 COPY ./Pipfile ./Pipfile.lock ./
+RUN ["pip", "install", "pipenv"]
 RUN ["pipenv", "requirements", "--dev", ">", "requirements.txt"]
 
 FROM python:3.12-alpine as build