This action can automatically configure gpg key if we set:

        gpg-private-key: ${{ secrets.MAVEN_GPG_PRIVATE_KEY }} # Value of the GPG private key to import
        gpg-passphrase: MAVEN_GPG_PASSPHRASE # env variable for GPG private key passphrase

But it is not clear for me what MAVEN_GPG_PRIVATE_KEY secret should contain. I have generated a gpg key in my local machine but how should I export it to be valid?
Maybe we can add a note in the readme?

thanks