fixed package update eror dockerfile

Dockerfile

@@ -7,6 +7,6 @@ WORKDIR /app
 # copying files
 COPY . /app/
 # package updations and installations
-RUN apt-update && pip install --upgrade pip && apt install poetry -y && chmod +x entrypoint.sh
+RUN apt-get update && apt-get install poetry -y && pip install --upgrade pip && chmod +x entrypoint.sh
 # code file to execute when the docker container starts up (`entrypoint.sh`)
 ENTRYPOINT ["/app/entrypoint.sh"]