Add roles to promote job

Change-Id: I0be0dbd14e5221131f4db6d114745e5d5ad6979e

playbooks/java-libraries/promote.yaml

@@ -1,6 +1,9 @@
 - hosts: all
   vars:
     library_path: "{{ zuul.project.src_dir }}/{{ java_libraries[0].context }}"
+  roles:
+    - install-jdk
+    - install-maven
 
   tasks:
     - name: Clean and prepare release

zuul.d/jobs.yaml

@@ -37,6 +37,8 @@
 - job:
     name: nebulous-promote-java-libraries
     run: playbooks/java-libraries/promote.yaml
+    roles:
+      - zuul: nebulous/zuul-jobs
     secrets:
       - name: nebulous_nexus_repository_credentials
         secret: nebulous-nexus-repository-credentials