Add build namespace to jenkins deployment

[bparry02]

What does this PR do?

Specify the missing build namespace for Jenkins as described in #133.

How should this be tested?

$ oc new-project my-newproject
$ oc delete project my-newproject
$ ansible-playbook -i ./.applier/ galaxy/openshift-applier/playbooks/openshift-cluster-seed.yml

Is there a relevant Issue open for this?

fixes #133

Who would you like to review this?

cc: @redhat-cop/containers-approvers

[bparry02]

/assign @oybed

[pabrahamsson]

Thank you for this fix @bparry02
/approve
/lgtm

[redhat-cop-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bparry02, pabrahamsson

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