Add maven executable to docker snapshot job

 - follow-up and correction to
   https://gerrit.onap.org/r/c/ci-management/+/116262

Issue-ID: CCSDK-3019
Signed-off-by: Lasse Kaihlavirta <l.kaihlavirt@partner.samsung.com>
Change-Id: I6eca59766404350878dc30e8cf5ce837616512c6
diff --git a/jjb/integration/integration-maven-jobs.yaml b/jjb/integration/integration-maven-jobs.yaml
index 5c7a503..885274b 100644
--- a/jjb/integration/integration-maven-jobs.yaml
+++ b/jjb/integration/integration-maven-jobs.yaml
@@ -136,5 +136,7 @@
           branch: '{branch}'
           refspec: 'refs/heads/{branch}'
           artifacts: '{archive-artifacts}'
+      - maven-exec:
+          maven-version: '{maven-version}'
       - integration-unique-docker-tag:
           unique-docker-tag: ''