compose: Unable to configure HTTPS endpoint. No server certificate was specified, and the default developer certificate could not be found

I am trying to run an ASP.NET Core 3.1 framework based app on an Ubuntu (18.04.3 LTS) server using Docker container.

First I created run the nginx-proxy image using the following docker-compose.yml` file

version: '3.4'
services:
  nginx-proxy:
    image: jwilder/nginx-proxy
    container_name: nginx-proxy
    ports:
      - "80:80"
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro

networks:
  default:
    external:
      name: nginx-proxy
secrets:
  server.cert:
    file: ./server.cert
  server.key:
    file: ./server.key

Both server.cert and server.key files are stored next to the docker-compose.yml file and were created using the following command

sudo openssl req -new -newkey rsa:4096 -days 3650 -nodes -x509 -subj "/C=US/ST=CA/L=SF/O=Docker-demo/CN=nginx-proxy.example.com" -keyout server.key -out server.cert

I ran that image using docker-composer up -d command.

Now that my nginx proxy is running, I created my first app using the following docker-composer.yml file

version: '3.4'

services:
  private_image:
    image: private_image:latest
    environment:
      - VIRTUAL_HOST=sub.domainsname.com
      - ASPNETCORE_ENVIRONMENT=Production
      - ASPNETCORE_URLS=https://+:443;http://+:80
    expose:
      - 80
      - 443
    ports:
      - 51736:80
      - 44344:443
    volumes:
      - storage:/storage
      - ${APPDATA}/Microsoft/UserSecrets:/root/.microsoft/usersecrets:ro
      - ${APPDATA}/ASP.NET/Https:/root/.aspnet/https:ro
    container_name: realestatestorage
volumes:
  storage:
networks:
  default:
    external:
      name: nginx-proxy
secrets:
  sub.domainsname.com.cert:
    file: ./sub.domainsname.com.cert
  sub.domainsname.com.key:
    file: ./sub.domainsname.com.key

Both sub.domainsname.com.cert and sub.domainsname.com.key files are stored next to the docker-compose.yml file and were created using the following command

sudo openssl req -new -newkey rsa:4096 -days 3650 -nodes -x509 -subj "/C=US/ST=CA/L=SF/O=PrivateImage/CN=sub.domainsname.com" -keyout sub.domainsname.com.key -out sub.domainsname.com.cert

When I run my private image using docker-compose up I get the following

WARNING: The APPDATA variable is not set. Defaulting to a blank string.
Recreating private_image ... done
Attaching to private_image
private_image    | crit: Microsoft.AspNetCore.Server.Kestrel[0]
private_image    |       Unable to start Kestrel.
private_image    | System.InvalidOperationException: Unable to configure HTTPS endpoint. No server certificate was specified, and the default developer certificate could not be found or is out of date.
private_image    | To generate a developer certificate run 'dotnet dev-certs https'. To trust the certificate (Windows and macOS only) run 'dotnet dev-certs https --trust'.
private_image    | For more information on configuring HTTPS see https://go.microsoft.com/fwlink/?linkid=848054.
private_image    |    at Microsoft.AspNetCore.Hosting.ListenOptionsHttpsExtensions.UseHttps(ListenOptions listenOptions, Action`1 configureOptions)
private_image    |    at Microsoft.AspNetCore.Hosting.ListenOptionsHttpsExtensions.UseHttps(ListenOptions listenOptions)
private_image    |    at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.AddressesStrategy.BindAsync(AddressBindContext context)
private_image    |    at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindAsync(IServerAddressesFeature addresses, KestrelServerOptions serverOptions, ILogger logger, Func`2 createBinding)
private_image    |    at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.StartAsync[TContext](IHttpApplication`1 application, CancellationToken cancellationToken)
private_image    | Unhandled exception. System.InvalidOperationException: Unable to configure HTTPS endpoint. No server certificate was specified, and the default developer certificate could not be found or is out of date.
private_image    | To generate a developer certificate run 'dotnet dev-certs https'. To trust the certificate (Windows and macOS only) run 'dotnet dev-certs https --trust'.
private_image    | For more information on configuring HTTPS see https://go.microsoft.com/fwlink/?linkid=848054.
private_image    |    at Microsoft.AspNetCore.Hosting.ListenOptionsHttpsExtensions.UseHttps(ListenOptions listenOptions, Action`1 configureOptions)
private_image    |    at Microsoft.AspNetCore.Hosting.ListenOptionsHttpsExtensions.UseHttps(ListenOptions listenOptions)
private_image    |    at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.AddressesStrategy.BindAsync(AddressBindContext context)
private_image    |    at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindAsync(IServerAddressesFeature addresses, KestrelServerOptions serverOptions, ILogger logger, Func`2 createBinding)
private_image    |    at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.StartAsync[TContext](IHttpApplication`1 application, CancellationToken cancellationToken)
private_image    |    at Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken cancellationToken)
private_image    |    at Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancellationToken)
private_image    |    at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
private_image    |    at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
private_image    |    at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost host)
private_image    |    at private_image.Program.Main(String[] args) in /src/private_image/Program.cs:line 17
private_image exited with code 139

The command dotnet dev-certs https --trust works on Windows and macOS only. But how can I fix this issue on Ubuntu?