`signing.gnupg.homeDir`::
Sets the home directory for GnuPG. If not given the default home directory of GnuPG is used.
`signing.gnupg.optionsFile`::
Sets a custom options file for GnuPG. If not given GnuPG's default configuration file is used.
`signing.gnupg.keyName`::
The id of the key that should be used for signing. If not given then the default key configured in GnuPG will be used.
`signing.gnupg.passphrase`::

        where:
        dsl << ['groovy', 'kotlin']
    }

    @UsesSample('signing/gnupg-signatory')
    @Requires(SigningTestPreconditions.GpgAvailable)
    def "use gnupg signatory with dsl #dsl"() {
        setup:
        def projectDir = sample.dir.file(dsl)
        def symlink = GpgCmdFixture.setupGpgCmd(projectDir)

        when:

import org.gradle.plugins.signing.internal.SignOperationInternal;
import org.gradle.plugins.signing.signatory.Signatory;
import org.gradle.plugins.signing.signatory.SignatoryProvider;
import org.gradle.plugins.signing.signatory.internal.gnupg.GnupgSignatoryProvider;
import org.gradle.plugins.signing.signatory.internal.pgp.InMemoryPgpSignatoryProvider;
import org.gradle.plugins.signing.signatory.pgp.PgpSignatoryProvider;