Is your feature request related to a problem?

There were two environmental variables NOTATION_LIBEXEC and NOTATION_CONFIG in Notation RC releases that can help users define the directory of Notation configuration files and plugin binaries respectively and pass the values to Notation in advance. See Notation directory structure for system configuration for the context. These two environmental variables were removed in RC release.

After revisiting the setup experience of notation signing and verification, it looks still useful if users want to use Notation in different OS. With these two environmental variables, users can easily define tell Notation where are the directory of Notation plugin binaries, trust policy, and key/cert files in advance. It will simplify signing and verification setup experience without manually retrieving those directory location from different operating system.

What solution do you propose?

Bring two environmental variables NOTATION_LIBEXEC and NOTATION_CONFIG back to Notation. Enable users to set the directory of Notation binaries and configuration files respectively by using these two environmental variables.

What alternatives have you considered?

NA

Any additional context?

No response