Make zuul jobs reusable for internal zuul setup

This change makes zuul jobs configurable on project level using variables.
That allows to reuse same jobs in other zuul setup with different base images,
docker registry and proxy settings.

Change-Id: I301ea09f42bc1498d3cba45eede075e0d5a6f8fa

.zuul.yaml

@@ -20,6 +20,16 @@
     vars:
       rtd_webhook_id: '38574'
       rtd_project_name: 'airship-pegleg'
+      proxy: ""
+      no_proxy: ""
+      use_proxy: false
+      docker_registry: "quay.io"
+      docker_registry_login_url: "https://quay.io/api/v1/"
+      deb_docker_repo: "{{ zuul_site_mirror_fqdn }}/deb-docker"
+      image_prefix: "airshipit"
+      base_image_bionic: "ubuntu:18.04"
+      base_image_opensuse: "opensuse/leap:15.1"
+      base_image_xenial: "ubuntu:16.04"
     check:
       jobs:
         - openstack-tox-pep8

tools/gate/playbooks/docker-image-build.yaml

@@ -29,6 +29,21 @@
         - debug:
             msg: "{{ tags | to_json }}"
 
+    - name: Set ubuntu bionic base image
+      set_fact:
+        base_image: "{{ base_image_bionic }}"
+      when: distro == 'ubuntu_bionic'
+
+    - name: Set ubuntu xenial base image
+      set_fact:
+        base_image: "{{ base_image_xenial }}"
+      when: distro == 'ubuntu_xenial'
+
+    - name: Set ubuntu opensuse base image
+      set_fact:
+        base_image: "{{ base_image_opensuse }}"
+      when: distro == 'opensuse_15'
+
     - name: Determine tags
       shell: echo '{{ tags | to_json }}' | python {{ zuul.project.src_dir }}/tools/image_tags.py
       environment:
@@ -67,7 +82,7 @@
         - apt_key:
             url: https://download.docker.com/linux/ubuntu/gpg
         - apt_repository:
-            repo: deb http://{{ zuul_site_mirror_fqdn }}/deb-docker xenial stable
+            repo: "deb http://{{ deb_docker_repo }} xenial stable"
         - apt:
             name: "{{ item }}"
             allow_unauthenticated: True
@@ -95,8 +110,12 @@
             chdir: "{{ zuul.project.src_dir }}"
             target: images
             params:
+              BASE_IMAGE: "{{ base_image }}"
               DISTRO: "{{ distro }}"
               IMAGE_TAG: "{{ item }}"
+              PROXY: "{{ proxy }}"
+              NO_PROXY: "{{ no_proxy }}"
+              USE_PROXY: "{{ use_proxy | lower }}"
           with_items: "{{ image_tags.stdout_lines }}"
 
         - shell: "docker images"
@@ -112,18 +131,22 @@
         - docker_login:
             username: "{{ airship_pegleg_quay_creds.username }}"
             password: "{{ airship_pegleg_quay_creds.password }}"
-            registry_url: "https://quay.io/api/v1/"
+            registry_url: "{{ docker_registry_login_url }}"
 
         - make:
             chdir: "{{ zuul.project.src_dir }}"
             target: images
             params:
-              DOCKER_REGISTRY: "quay.io"
-              IMAGE_PREFIX: "airshipit"
+              BASE_IMAGE: "{{ base_image }}"
+              DOCKER_REGISTRY: "{{ docker_registry }}"
+              IMAGE_PREFIX: "{{ image_prefix }}"
               DISTRO: "{{ distro }}"
               IMAGE_TAG: "{{ item }}"
               COMMIT: "{{ zuul.newrev | default('') }}"
               PUSH_IMAGE: "true"
+              PROXY: "{{ proxy }}"
+              NO_PROXY: "{{ no_proxy }}"
+              USE_PROXY: "{{ use_proxy | lower }}"
           with_items: "{{ image_tags.stdout_lines }}"
 
         - shell: "docker images"