How do you use sbt-pgp with a different command to call gpg? I have tried gpgCommand with no success

Question

I am using sbt-pgp in our ci pipeline and want to use Global / gpgCommand := to specify a different gpg version to call than the OS default. OS default path uses gpg version 1.x and I want to call gpg2 for version 2.x.

Following the README.md of sbt-pgp i added Global / gpgCommand := to ~/.sbt/gpg.sbt, when I do nothing happens and the original gpg command is still called.

I then tried moving Global / gpgCommand := to the build.sbt and tried $HOME/.sbt/1.0/global.sbt and I get this error:

build.sbt:25: error: not found: value gpgCommand

any thoughts on what I am doing wrong? Thanks for all help all.

for gpgCommand I have tried:

Global / gpgCommand := "/usr/bin/gpg2"

Also tried:

Global / gpgCommand := (baseDirectory.value / "gpg.sh").getAbsolutePath

where gpg.sh is:

#!/bin/sh

gpg2 $@