Support Podman, and Kubernetes in addition to Docker

[phreed]

Server/src/takserver-schemamanager/scripts/takserver-setup-db.sh

Lines 84 to 90 in a4e4453

	echo "Checking if running in docker container..."
	if [ -f /.dockerenv ]; then
	echo "Docker installation detected.";
	IS_DOCKER=true
	else
	echo "Not running in a container.";
	fi

The test for /.dockerenv only works for docker containers.
This could be expanded to work for Podman containers as well.

echo "Checking if running in a container..."
if [ -f /.dockerenv ]; then
    echo "Docker installation detected.";
    IS_DOCKER=true
    IS_CONTAINER=true
elif [ -f /run/.containerenv ]; then
    echo "Podman installation detected.";
    IS_PODMAN=true	
    IS_CONTAINER=true
else
    echo "Not running in a container.";
fi

I do not know what the situation is within a Kubernetes POD.

This would, of course require updating all uses of IS_DOCKER to IS_CONTAINER.