Summary
At this time, defining a variable with the name "PATH" in Account variables, Repository variables, and Deployment variables. The default $PATH variable on the image being running gets overridden and results in the following error:

<command_name>: Command not found

It would be great if we can make users aware of this on the pipeline variables page and in the form of relevant documentation.

Workaround
Avoid using "PATH" as a variable name in the account, repository, and deployment variable sections for the reason shared above.

Try using a detailed name that adds more context on why the variable is being used, example: "remote_path", "web_path", "destination_path" etc.