Run official Adminer Docker with auto-login

docker-compose.yml

version: "3.0"
name: adminer

services:
  adminer:
    image: adminer
    environment:
      ADMINER_DEFAULT_DRIVER: sqlite        # server=mysql, pgsql, sqlite, sqlite2, oracle, mssql, mongo, elastic
      ADMINER_DEFAULT_DB: /data/database.db # path to SQLite database or DBMS database name
      ADMINER_DEFAULT_SERVER:               # DBMS IP or hostname
      ADMINER_DEFAULT_USERNAME:
      ADMINER_DEFAULT_PASSWORD:
      ADMINER_DESIGN: dracula # use 'pepa-linha' for a nice light theme. https://www.adminer.org/#extras
      ADMINER_PLUGINS: tables-filter table-structure edit-textarea dump-json # https://www.adminer.org/en/plugins/
    volumes: 
      - datavolume:/data # set-up volumes or mounts, if using SQLite
    ports: [127.0.0.1:8091:8080] # binding to localhost restricts access to local network
    configs: [{ source: adminer-index.php, target: /var/www/html/index.php }]
configs:
  adminer-index.php:
    # Patched version of index.php to set default values for adminer and to
    # allow passwordless login whenever ADMINER_DEFAULT_DRIVER is sqlite.
    content: |
      <?php
      namespace docker {
        function adminer_object() {
          require_once('plugins/plugin.php');
          class Adminer extends \AdminerPlugin {
            function _callParent($$function, $$args) {
              if ($$function === 'loginForm') {
                ob_start();
                $$return = \Adminer::loginForm();
                $$form = ob_get_clean();
                $$driver = $$_ENV["ADMINER_DEFAULT_DRIVER"] ?: "server";
                $$server = $$_ENV["ADMINER_DEFAULT_SERVER"] ?: "db";
                $$username = $$_ENV["ADMINER_DEFAULT_USERNAME"];
                $$password = $$_ENV["ADMINER_DEFAULT_PASSWORD"];
                $$db = $$_ENV["ADMINER_DEFAULT_DB"];
                $$form = preg_replace('/ name="auth\[server\]" value="(.*)"/', ' name="auth[server]" value="' . $$server . '"', $$form);
                $$form = str_replace(' id="username" value="" ', ' id="username" value="' . $$username . '" ', $$form);
                $$form = str_replace('name="auth[db]" value=""', 'name="auth[db]" value="' . $$db . '" ', $$form);
                $$form = str_replace('type="password"', 'type="password" value="' . $$password . '"', $$form);
                $$form = preg_replace('/<option value="(.*)" selected/', '/<option value="$$1"/', $$form);
                $$form = preg_replace('/<option value="' . $$driver . '"/', '<option value="' . $$driver . '" selected', $$form);
                echo $$form;
                return $$return;
              }
              return parent::_callParent($$function, $$args);
            }
          }
          $$plugins = [];
          foreach (glob('plugins-enabled/*.php') as $$plugin) {
            $$plugins[] = require($$plugin);
          }
          class AdminerSoftware extends Adminer {
            function login($$login, $$password) {
                return substr($$_ENV["ADMINER_DEFAULT_DRIVER"], 0, 6) == 'sqlite' ? true : parent::login($$login, $$password);
            }
          }
          return new AdminerSoftware($$plugins);
        }
      }
      namespace {
        if (basename($$_SERVER['DOCUMENT_URI'] ?? $$_SERVER['REQUEST_URI']) === 'adminer.css' && is_readable('adminer.css')) {
          header('Content-Type: text/css');
          readfile('adminer.css');
          exit;
        }
        function adminer_object() {
            return \docker\adminer_object();
        }
        require('adminer.php');
      }