Usage: deploy on OpenFaaS
echo "<password>" | faas-cli login -g <gateway URL> -u <username> --password-stdin
faas-cli deploy -g <gateway URL> -f ./stack.yml
Development: build and push to Docker Hub
echo "<password>" | docker login -u abulava --password-stdin
faas-cli build -f ./stack.yml
faas-cli push -f ./stack.yml