Build a Debian IPA image when DIB changes merge

In order to to speed CI build times for bifrost, we will
attempt to pre-build the IPA image when changes have been
committed to diskimage-builder, as the ironic-agent build
element is with-in the diskimage-builder repository.

Change-Id: If9363bff535f9d1fc9692767ac9194923030cfe7

jenkins/jobs/diskimage-builder.yaml

@@ -25,3 +25,41 @@
 
     publishers:
       - console-log
+- job:
+    name: 'dib-buildimage-debian-ironic-agent'
+    node: 'bare-trusty'
+
+    builders:
+      - link-logs
+      - net-info
+      - shell: |
+          #!/bin/bash -eux
+          cd ~
+
+          /usr/zuul-env/bin/zuul-cloner --cache-dir /opt/git \
+            git://git.openstack.org \
+            openstack/diskimage-builder \
+            openstack/dib-utils
+
+          export PATH=$PATH:$(pwd)/openstack/dib-utils/bin
+          export PATH=$PATH:$(pwd)/openstack/diskimage-builder/bin
+
+          ./openstack/diskimage-builder/tests/install_test_deps.sh
+
+          DIB_RELEASE="jessie" diskimage-builder \
+            -o ~/debian-jessie-ironic-agent \
+            debian ironic-agent
+
+    publishers:
+      - scp:
+          site: 'tarballs.openstack.org'
+          files:
+            - source: 'debian-jessie-ironic-agent.vmlinuz'
+              target: 'images/ironic-agent/debian-jessie/'
+              keep-hierarchy: false
+              copy-after-failure: false
+            - source: 'debian-jessie-ironic-agent.initramfs'
+              target: 'images/ironic-agent/debian-jessie/debian-jessie-ironic-agent.initramfs'
+              keep-hierarchy: false
+              copy-after-failure: false
+      - console-log

zuul/layout.yaml

@@ -4451,6 +4451,7 @@ projects:
       - gate-tempest-dsvm-ironic-pxe_ssh-dib
     post:
       - dib-utils-branch-tarball
+      - dib-buildimage-debian-ironic-agent
 
   - name: openstack/diskimage-builder
     template:
@@ -4472,6 +4473,8 @@ projects:
       - gate-dib-dsvm-functests-devstack-centos7
       - gate-dib-dsvm-functests-devstack-f21
       - gate-tempest-dsvm-ironic-pxe_ssh-dib
+    post:
+      - dib-buildimage-debian-ironic-agent
 
   - name: openstack/distil
     template: