To fix container build

api/Dockerfile

 FROM python:3.9-alpine
 
-COPY api.py /app/api.py
-COPY requirements.txt /app/requirements.txt
-COPY books.db /app/books.db
+COPY . /app/
 
-RUN pip3 install -r /app/requirements.txt
+RUN pip3 install flask
 
 EXPOSE 5000
 

api/Requirements.txt

-flask
\ No newline at end of file