As can be easily guessed, the container creates a longhornsystembackup for a given kubeconfig.
In this example $KUBECONFIG_DATA is the base64 encoded string based on the kubeconfig.
Example:
cat $FILE | base64
Run the container:
docker run --rm -it \
-e KUBECONFIG_DATA=$KUBECONFIG_DATA \
quving/longhornsystembackup:latest