container-images: incorporate, test and publish centos8

This leverages the contribution from Fabian [1] for building an image
based on CentOS8.
The image will be built and tested for every new patch with Zuul and
it'll be pushed to DockerHub [2] after every merge.

The tag nomenclature had to be changed in order to fit the distribution
as an attribute, before:
- latest (tagged from source-latest)
- pypi-latest
- distribution-latest
- source-latest

to:
- latest (tagged from fedora32-source-latest)
- fedora32-source-latest
- fedora32-distribution-latest
- fedora32-pypi-latest
- centos8-pypi-latest

[1]: 8491cc5a72
[2]: https://hub.docker.com/r/recordsansible/ara-api

Change-Id: I971abd97039a28e825b6b7cd43a7559abe709f30

contrib/container-images/README.rst

@@ -25,12 +25,17 @@ Building an image with buildah
 
 You will need to install `buildah <https://github.com/containers/buildah/blob/master/install.md>`_.
 
-The different scripts to build container images are available in the
-`git source repository <https://github.com/ansible-community/ara/tree/master/contrib/container-images>`_:
+The different scripts to build container images are available in the git repository:
 
-- ``fedora-distribution.sh``: Builds an image from Fedora 32 `distribution packages <https://koji.fedoraproject.org/koji/packageinfo?packageID=24394>`_
-- ``fedora-pypi.sh``: Builds an image from `PyPi <https://pypi.org/project/ara>`_ packages on Fedora 32
-- ``fedora-source.sh``: Builds an image from `git source <https://github.com/ansible-community/ara>`_ on Fedora 32
+- fedora32-distribution.sh_: Builds an image from Fedora 32 `distribution packages <https://koji.fedoraproject.org/koji/packageinfo?packageID=24394>`_
+- fedora32-pypi.sh_: Builds an image from `PyPi <https://pypi.org/project/ara>`_ packages on Fedora 32
+- fedora32-source.sh_: Builds an image from `git source <https://github.com/ansible-community/ara>`_ on Fedora 32
+- centos8-pypi.sh_: Builds an image from `PyPi <https://pypi.org/project/ara>`_ packages on CentOS 8
+
+.. _fedora32-distribution.sh: https://github.com/ansible-community/ara/blob/master/contrib/container-images/fedora32-distribution.sh
+.. _fedora32-pypi.sh: https://github.com/ansible-community/ara/blob/master/contrib/container-images/fedora32-pypi.sh
+.. _fedora32-source.sh: https://github.com/ansible-community/ara/blob/master/contrib/container-images/fedora32-source.sh
+.. _centos8-pypi.sh: https://github.com/ansible-community/ara/blob/master/contrib/container-images/centos8-pypi.sh
 
 The scripts have no arguments other than the ability to specify an optional name
 and tag:
@@ -39,7 +44,7 @@ and tag:
 
     $ git clone https://github.com/ansible-community/ara
     $ cd ara/contrib/container-images
-    $ ./fedora-source.sh ara-api:latest
+    $ ./fedora32-source.sh ara-api:latest
     # [...]
     Getting image source signatures
     Copying blob 59bbb69efd73 skipped: already exists
@@ -89,6 +94,7 @@ You can validate if the container is running properly with podman:
     $ podman ps
     CONTAINER ID  IMAGE                     COMMAND               CREATED         STATUS             PORTS                   NAMES
     bc4b7630c265  localhost/ara-api:latest  /usr/bin/gunicorn...  12 seconds ago  Up 11 seconds ago  0.0.0.0:8000->8000/tcp  api-server
+
     $ podman logs api-server
     [ara] No setting found for SECRET_KEY. Generating a random key...
     [ara] Writing default settings to /opt/ara/settings.yaml

tests/with_container_images.yaml

@@ -25,14 +25,17 @@
       # These are in chronological order of release so that we don't end up
       # running SQL migrations backwards during the tests.
       - name: localhost/ara-api
-        tag: distribution-latest
-        script: fedora-distribution.sh
+        tag: fedora32-source-latest
+        script: fedora32-source.sh
       - name: localhost/ara-api
-        tag: pypi-latest
-        script: fedora-pypi.sh
+        tag: fedora32-pypi-latest
+        script: fedora32-pypi.sh
       - name: localhost/ara-api
-        tag: source-latest
-        script: fedora-source.sh
+        tag: centos8-pypi-latest
+        script: centos8-pypi.sh
+      - name: localhost/ara-api
+        tag: fedora32-distribution-latest
+        script: fedora32-distribution.sh
   tasks:
     - name: Install git, buildah and podman
       become: yes

tests/zuul_publish_dockerhub.yaml

@@ -23,20 +23,22 @@
     images:
       # These images are meant to be provided by the "with_container_images.yaml" playbook
       - name: localhost/ara-api
-        tag: distribution-latest
+        tag: fedora32-source-latest
       - name: localhost/ara-api
-        tag: pypi-latest
+        tag: fedora32-pypi-latest
       - name: localhost/ara-api
-        tag: source-latest
+        tag: centos8-pypi-latest
+      - name: localhost/ara-api
+        tag: fedora32-distribution-latest
   tasks:
     - name: Tag images with buildah
       command: |
         buildah tag {{ item.name }}:{{ item.tag }} {{ destination }}:{{ item.tag }}
       loop: "{{ images }}"
 
-    - name: Tag latest from source-latest
+    - name: Tag latest from fedora32-source-latest
       command: |
-        buildah tag {{ destination }}:source-latest {{ destination }}:latest
+        buildah tag {{ destination }}:fedora32-source-latest {{ destination }}:latest
 
     - name: Push latest
       command: |