Create .env.template

[Mixtol]

Hello!
In the existing description it is described rather scattered how and where to set environment variables
It would be nice to create a file with the environment as an example like in the main misp repository. 🤔

[Benni0]

The required variables are already in the docker-compose.yaml under environment. If you use docker compose for your deployment, you can modify and add further variables there. Otherwise the way to set the environment variables depends on your environment and deployment method.