Knijn hosting is free hosting for you, all you need to do is join the server and apply for a server.
If you need help with logging into your docker container go to this link
What is what?
|Name (Starts with)||What it is||Why would I use it?|
|P||A service on the panel||It is easy to set up|
|Name||CPU||RAM Allocation||OS||What you can host here|
|P1||ARM_64||1536Mb (1.5Gb)||Ubuntu Linux 20.04.2 LTS||A Java Minecraft Server*1|
*1 - Spigot is not supported