NORDIX: Introduce ssh key with passphrase for push-upstream job

New key is introduced that is stored only in the jenkins
along with passphrease. For now users can still used the
old key.

Change-Id: I14a5966ed3b84333fceda30ae8457a911b8f42c5
diff --git a/jjb/global/global-templates-push-upstream.yaml b/jjb/global/global-templates-push-upstream.yaml
index 70048b9..0cea409 100644
--- a/jjb/global/global-templates-push-upstream.yaml
+++ b/jjb/global/global-templates-push-upstream.yaml
@@ -33,6 +33,9 @@
     wrappers:
       - build-timeout:
           timeout: 10
+      - ssh-agent-credentials:
+          users:
+            - 'infra-upstream-gerrit-ssh-passphrase'
 
     builders:
       - shell: