Install appc-spec by entering the following commands in the terminal:
sudo apt update sudo apt install appc-spec
App Container Specification (appc) - tools
App Container (appc) is a well-specified and community developed specification for application containers. appc defines several independent but composable aspects involved in running application containers, including an image format, runtime environment, and discovery mechanism for application containers. . This package provides "actool" utility for the App Container (appc) specification and technical details on how an appc image is downloaded over a network, cryptographically verified, and executed on a host.