Clone this repo somewhere and configure it via the .env file.
Put a default avatar into ./avatars/0.png
You also need to generate ssl keys. Run something like this.
mkdir keys
sudo openssl req -x509 -nodes -days 99999 -newkey rsa:2048 -keyout ./keys/ppy.sh.key.pem -out ./keys/ppy.sh.cert.pem -subj "/C=US/ST=Denial/L=Springfield/O=Dis/CN=*.ppy.sh"
Also make sure you've got valid keys in ./keys/domain.cert.pem and ./keys/domain.key.pem. Note that it's domain, and not your domain. You can either use something like let's encrypt for now or copy the files from above. After that, with docker and docker-compose installed, you should be able to just run sudo docker-compose up -d to get the server running. You should also maybe not run phpmyadmin and portainer without any additional protection beyond the initial setup. The default database account is root:v3ris3cur3 (though you should have changed the password).
With the default configuration, you can access phpmyadmin via host:8056 and portainer via host:9000.
You can always change the .env config at a later time and only need to restart the affected containers for the changes to take effect, with the exception of the database password which is stored inside the database after the first launch and thus requires additional steps (ie none of your services can connect because mysql still expects the original password).
You need to put these lines with the ip of your server into your hosts file:
192.168.56.104 osu.ppy.sh
192.168.56.104 c.ppy.sh
192.168.56.104 c1.ppy.sh
192.168.56.104 c2.ppy.sh
192.168.56.104 c3.ppy.sh
192.168.56.104 c4.ppy.sh
192.168.56.104 c5.ppy.sh
192.168.56.104 c6.ppy.sh
192.168.56.104 ce.ppy.sh
192.168.56.104 a.ppy.sh
192.168.56.104 s.ppy.sh
192.168.56.104 i.ppy.sh
192.168.56.104 bm6.ppy.sh
Lastly, import the ./keys/ppy.sh.cert.pem into your client's Trusted certificate store.