I am using adminer over nginx-proxy. Relevant docker-compose lines:

version: "3"

services:
  nginx:
    image: "jc21/nginx-proxy-manager:latest"
    hostname: websin.space
    container_name: npm
    restart: always
    ports:
      - "80:80"
      - "81:81"
      - "443:443"
    volumes:
      - ./data:/data
      - ./letsencrypt:/etc/letsencrypt

  db:
    image: mysql:latest
    volumes:
      - ./db:/var/lib/mysql
      - ./init:/docker-entrypoint-initdb.d
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: doNotTellPasswordsOnStackOverflow
      MYSQL_DATABASE: so
      MYSQL_USER: so
      MYSQL_PASSWORD: doNotTellPasswordsOnStackOverflow

  adminer:
    image: adminer
    restart: always
    ports:
      - 9080:8080
    environment:
      ADMINER_DEFAULT_SERVER: db
    depends_on:
      - db    

Now, when I deploy it, I can connect to the database over
http://websin.space:9080 as I specified port in the yaml file.

However, I would like to make this connection secure. How can I do that?