fix before_install section

Author: mateusz-bajorek

.travis.yml

@@ -12,9 +12,8 @@ install:
   - mvn --settings .travis/mvnsettings.xml install -DskipTests=true -Dgpg.skip -Dmaven.javadoc.skip=true -B -V
 
 before_install:
-  -
-    provider: script
-    script: .travis/before-install.sh
+  - if [ ! -z "$GPG_SECRET_KEYS" ]; then echo $GPG_SECRET_KEYS | base64 --decode | $GPG_EXECUTABLE --import; fi
+  - if [ ! -z "$GPG_OWNERTRUST" ]; then echo $GPG_OWNERTRUST | base64 --decode | $GPG_EXECUTABLE --import-ownertrust; fi
 
 deploy:
   -