chore: unbreak deploy by building a WAR file

When we remove execution of the integration tests (mvn verify), we also miss that it was creating
WAR file that is used during deployment.

Correction for 6003e01 commit.

Relate to #1154

Author: php-coder

Diff for: .travis.yml

@@ -12,6 +12,9 @@ before_script:
   - trap 'travis_terminate 1' ERR;
     pip install --user ansible==2.9.27;
 
+script:
+  - mvn clean package
+
 deploy:
   provider: script
   script: ./src/main/scripts/ci/deploy.sh