Before start

git submodule update --init

Set up java alternatives

sudo update-alternatives --config java

Select something like /usr/lib/jvm/java-25-openjdk/bin/java

Docker deploy

export CR_PAT=YOUR_TOKEN
echo $CR_PAT | docker login ghcr.io -u "$USER" --password-stdin

docker build --no-cache -t ghcr.io/realtime-messenger/backend:latest .
docker push ghcr.io/realtime-messenger/backend:latest