fix: allow configuring port for test database (#6236)

The `testing` database used for the tests had no way to configure a db
server port. It always used some default fallback port (probably of the
pdo driver).

Added the `port` config setting with a new env variable `DB_TEST_PORT`.

Fixes #6200

.env.example

@@ -41,6 +41,7 @@ DB_USERNAME=homestead
 DB_PASSWORD=secret
 DB_PREFIX=
 DB_TEST_HOST=127.0.0.1
+DB_TEST_PORT=3306
 DB_TEST_DATABASE=monica_test
 DB_TEST_USERNAME=homestead
 DB_TEST_PASSWORD=secret

config/database.php

@@ -99,6 +99,7 @@ $db = [
         'testing' => [
             'driver' => env('DB_TEST_DRIVER', 'mysql'),
             'host' => env('DB_TEST_HOST'),
+            'port' => env('DB_TEST_PORT', '3306'),
             'unix_socket' => env('DB_TEST_UNIX_SOCKET', ''),
             'database' => env('DB_TEST_DATABASE'),
             'username' => env('DB_TEST_USERNAME'),