header.inc.php contains hashes, NOT passwords (unless prefixed with {plain}).
You need to check /var/lib/egroupware/egroupware-docker-install.log for the generated admin password for Setup.
Yeap, browser disallows to load http-urls, if the page uses https!
Can happen when:
- you have an http webserver-url set in setup > configuration, default is
/egroupware which is fine
- you use an other proxy in front for https termination, which does NOT set a
X-Forwarded-Proto header with value https
You need to fix that!
Ralf