travis: don't deploy releases

travis/build.sh

@@ -1,6 +1,11 @@
 #!/bin/bash
 
-if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then
+PROJECT_VERSION=`mvn -q -Dexec.executable="echo" -Dexec.args='${project.version}' --non-recursive exec:exec`
+
+# Don't deploy pull requests (there are no secrets, anyway)
+# And don't deploy releases, they are already deployed by the updater before this,
+# and are signed.
+if [[ "${TRAVIS_PULL_REQUEST}" = "false" && $PROJECT_VERSION == *"-SNAPSHOT" ]]; then
 	mvn clean deploy --settings travis/settings.xml
 else
 	mvn clean verify --settings travis/settings.xml