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How to resolve issues with WARNING: Ignoring APKINDEX.40a3604f.tar.gz: No such file or directory?

Please, can someone help me? I am a beginner, i don’t know where i got it wrong. i’m trying to build my docker image but when i run: docker build ., i got the following errors:

ERROR: http://dl-cdn.alpinelinux.org/alpine/v3.12/main: temporary error (try again later)
WARNING: Ignoring APKINDEX.2c4ac24e.tar.gz: No such file or directory
ERROR: http://dl-cdn.alpinelinux.org/alpine/v3.12/community: temporary error (try again later)
WARNING: Ignoring APKINDEX.40a3604f.tar.gz: No such file or directory
2 errors; 35 distinct packages available
The command ‘/bin/sh -c apk update’ returned a non-zero code: 2

See below my Dockerfile file
FROM python:3.7-alpine
MAINTAINER Tboost Technology
#set environment variable
ENV PYTHONUNBUFFERED 1

            #install dependencies
            COPY ./requirements.txt /requirements.txt
            RUN apk update
            RUN rm -rf /var/cache/apk/* && \
                rm -rf /tmp/*
            RUN apk update \
                && apk add --update --no-cache postgresql-client
            RUN apk add --update --no-cache --virtual .tmp-build-deps \
                gcc libc-dev python3-dev linux-headers postgresql-dev
            RUN pip3 install -r /requirements.txt
            RUN apk del .tmp-build-deps

            #mkdir to store your apps source code
            RUN mkdir /app
            WORKDIR /app
            COPY ./app /app

            #create user to run apps in the docker
            RUN adduser -D user
            #switch to the user
            USER user

My docker-compose.yml file
version: “3”

services: 
    app:
        build: 
            context: .
        ports: 
            - "8000:8000"
        extra_hosts: 
            - "host.docker.internal:172.17.0.1"
        volumes: 
            - ./app:/app
        command: >
            sh -c "python manage.py runserver 0.0.0.0:8000"
        environment: 
            - DB_HOST=db
            - DB_NAME=app
            - DB_USER=postgres
            - DB_PASS=supersecretpassword
        depends_on: 
            - db
    db:
        image: postgres:11-alpine
        restart: always
        environment: 
            - POSTGRES_DB=app
            - POSTGRES_USER=postgres
            - POSTGRES_PASSWORD=supersecretpassword

and my requirements.txt file
Django>=3.0.7,<3.0.8
djangorestframework>=3.11.0,<3.12.0
psycopg2>=2.7.5,<2.8.0
flake8>=3.6.0,<3.7.0

doing apk update fixes the problem (updates the index).

Request: Improve the error message.

Thanks for your response but please looking at my Dockerfile, i have update the package. Please how could i implement this? I am a newbie.