geode-examples on the release branch prompts for a gpg password

When building geode-examples using ./gradlew build from the release/1.2.0 branch, I get prompted to enter my gpg password. Since our instructions on running the examples tell the user to run gradlew build, they will hit this prompt when building the released examples.

Travis is also showing this failure:
https://travis-ci.org/apache/geode-examples/builds/244002605

You must configure your signing.keyId and signing.secretKeyRingFile

in ~/.gradle/gradle.properties in order to sign jars

See https://cwiki.apache.org/confluence/display/GEODE/Release+Steps

FAILURE: Build failed with an exception.