Wrong APP_KEY generation command in the Docker environment file

[brlin-tw]

The following comment line in the Docker environment file:

https://github.com/snipe/snipe-it/blob/master/.env.docker#L12

has a Docker Compose command that referenced an inexistent snipeit service name, which leads to the following error when attempting to run it:

$ docker compose run --rm snipeit php artisan key:generate --show
no such service: snipeit

[welcome]

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