I have an issue that I added inside config.ini.php the following code:
force_ssl = 1
force_ssl_login = 1
How to manage without warning as it is all the time:
Forced SSL Connection
We recommend using Matomo over secure SSL connections only. To prevent insecure access over http, add force_ssl = 1 to the General section in your Matomo config/config.ini.php file.