Summary
The user is asking how to pass a single argument to Earthly at runtime, similar to Podman's -e ARCH=x86_64, without using a .args file for each execution. They mention the syntax earthly +my-target --ARCH=x86_64 as a potential solution but find it inadequately highlighted in the documentation. The user suggests that this example should be made more prominent in the documentation for the ARG command and included in the help section for Earthly, particularly in the USAGE: section of --help. They also express willingness to contribute a pull request to improve the documentation.