Add Debian/source CI job

For start just simple debian/source build job.

Depends-On: https://review.opendev.org/676896
Depends-on: https://review.opendev.org/676905
Depends-on: https://review.opendev.org/676909

Change-Id: I55e2b32c673f5e06458bec6e88184c3415f1f1fa

.zuul.d/base.yaml

@@ -37,6 +37,12 @@
       - name: primary
         label: ubuntu-bionic
 
+- nodeset:
+    name: kolla-debian-buster
+    nodes:
+      - name: primary
+        label: debian-buster
+
 - job:
     name: kolla-base
     parent: base

.zuul.d/debian.yaml

@@ -0,0 +1,15 @@
+---
+- project:
+    check:
+      jobs:
+        - kolla-build-debian-source
+
+- job:
+    name: kolla-build-debian-source
+    parent: kolla-base
+    nodeset: kolla-debian-buster
+    voting: false
+    vars:
+      action: build
+      base_distro: debian
+      install_type: source