I'd like to start a Cardano node in Devnet (not Testnet).
I looked for the configuration files in here, but it seems they are not available.
Is this even possible?
Looks like devnet refers to your local/private environment.
The Hydra-POC docs refer to it as 'a single Cardano node producing blocks used as a local devnet'
More details about Hydra-POC set up here: https://hydra.family/head-protocol/docs/getting-started/demo/with-docker/
There are 'With Docker' and 'Without Docker' instructions.
The 'With Docker' portion notes: 'From there, we can run the ./prepare-devnet.sh script to create an initial configuration for our development network'.