无法在docker linux中运行Asp.Net Core

我正在尝试使用docker-compose在docker内部运行ASP.Net Core。这里是dockerfile内容：

FROM microsoft/dotnet:2.2-aspnetcore-runtime AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443


FROM microsoft/dotnet:2.2-sdk AS build
WORKDIR /src
COPY ["SchoolContact/SchoolContact.csproj", "SchoolContact/"]
RUN dotnet restore "SchoolContact/SchoolContact.csproj"
COPY . .
WORKDIR "/src/SchoolContact"
RUN dotnet build "SchoolContact.csproj" -c Release -o /app

FROM build AS publish
RUN dotnet publish "SchoolContact.csproj" -c Release -o /app

FROM base AS final
WORKDIR /app
ENV ASPNETCORE_URLS http://+:5000
EXPOSE 5000 80
COPY --from=publish /app .
ENTRYPOINT ["dotnet", "SchoolContact.dll"]

这里是docker-compose.yml内容：

version: '3'

services:
  api:
        image: schoolcontact
        build:
          context: .
          dockerfile: SchoolContact/Dockerfile
        links:
          - db:db
        ports:
          - '5000:5000'
        restart: always
        networks:
          - school
  db:
      image: mysql:5.7
      volumes:
        - ./db:/var/lib/mysql
      restart: always
      environment:
        MYSQL_ROOT_PASSWORD: 123456
        MYSQL_DATABASE: Test
        MYSQL_USER: admin
        MYSQL_PASSWORD: 123456
      networks:
        - school

  phpmyadmin:
        depends_on:
          - db
        image: phpmyadmin/phpmyadmin
        restart: always
        ports:
          - '8080:80'
        environment:
          PMA_HOST: db
          MYSQL_ROOT_PASSWORD: 123456 
        networks:
          - school

  reverse-proxy:
        container_name: proxy
        image: nginx
        depends_on:
          - api
        ports:
          - "9090:8080"
        volumes:
          - ./proxy.conf:/etc/nginx/conf.d/default.conf
        networks:
          - school

networks:
  school:
volumes:
    db:
       driver: "local"

的proxy.conf：

server {
    listen 8080;

    location / {
      proxy_pass http://api:5000;
    }
}

在这里发布并寻求帮助之前，我尝试了太多次了，我尝试了不带nginx，不带端口或不带端口的多种方式运行。但是我仍然无法访问该应用程序。我的最终目的是将应用程序托管在docker中，并可以通过URL访问它http://localhost:5000。我不知道我在哪里错了或者错过了其他东西。我真的需要帮助。谢谢阅读。