Maven-gpg-plugin and --pinentry-mode loopback to sign artifacts of the build

I’m trying to get my maven build to sign the artifacts it produces. I have the ‘maven-gpg-plugin’ working fine locally, but on travis-ci, it appears the gpg-agent does not support using “–pinentry-mode loopback” option. Here’s the CI build error:

[INFO] --- maven-gpg-plugin:1.6:sign (sign-artifacts) @ nexus-format-archetype ---
gpg: setting pinentry mode 'loopback' failed: Not supported
gpg: signing failed: Inappropriate ioctl for device
gpg: signing failed: Inappropriate ioctl for device

The ‘maven-gpg-plugin’ is configured to send the key passphrase like so:

          <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-gpg-plugin</artifactId>
        <version>1.6</version>
        <executions>
          <execution>
            <id>sign-artifacts</id>
            <phase>verify</phase>
            <goals>
              <goal>sign</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <gpgArguments>
            <gpgArgument>--pinentry-mode</gpgArgument>
            <gpgArgument>loopback</gpgArgument>
          </gpgArguments>
        </configuration>
      </plugin>

FWIW, I made sure the various gpg keys are imported from env vars and successfully loaded into the travis gpg db.

I stumbled about trying to reconfigure the gpg-agent to support --pinentry, but failed. Any idea how I can get this working on Travis? Thanks!

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