upstream CI: Use Azure 'loops' to create stages

This patch modify the pipelines to create stages using the 'each'
expression on Azure pipelines, so that the configuration and the list of
distributions can be set using variables.

Testing CentOS 8 Stream and Galaxy collections still need to be handled
in a separate group, although, the pipeline configuration becomes easily
changed, specially when updating Ansible versions.

infra/azure/azure-pipelines.yml

@@ -5,72 +5,64 @@ trigger:
 pool:
   vmImage: 'ubuntu-20.04'
 
+variables:
+  ansible_version: "-core >=2.16,<2.17"
+  ansible_latest: "-core"
+  ansible_minimum: "-core <2.16"
+  distros: "fedora-latest,c9s,fedora-rawhide"
+
 stages:
 
-# Fedora
-
-- stage: Fedora_Ansible_Latest
+- stage: fedora_latest_ansible_latest
   dependsOn: []
   jobs:
   - template: templates/group_tests.yml
     parameters:
       build_number: $(Build.BuildNumber)
       distro: fedora-latest
-      ansible_version: "-core"
+      ansible_version: ${{ variables.ansible_latest }}
       skip_git_test: true
 
-# Fedora
-
-- stage: Fedora_Ansible_min_supported
+- stage: fedora_latest_ansible_2_15
   dependsOn: []
   jobs:
   - template: templates/group_tests.yml
     parameters:
       build_number: $(Build.BuildNumber)
       distro: fedora-latest
-      ansible_version: "-core <2.16"
+      ansible_version: ${{ variables.ansbile_minimum }}
       skip_git_test: true
 
-# Fedora
+# Supported distros
 
-- stage: Fedora_Latest
-  dependsOn: []
-  jobs:
-  - template: templates/group_tests.yml
-    parameters:
-      build_number: $(Build.BuildNumber)
-      distro: fedora-latest
-      skip_git_test: true
-      ansible_version: "-core >=2.16,<2.17"
+- ${{ each distro in split(variables.distros, ',') }}:
+  - stage: ${{ replace(distro, '-', '_') }}_ansible_2_16
+    dependsOn: []
+    jobs:
+    - template: templates/group_tests.yml
+      parameters:
+        build_number: $(Build.BuildNumber)
+        distro: ${{ distro }}
+        ansible_version: ${{ variables.ansible_version }}
+        skip_git_test: true
+        test_galaxy: false
 
 # Galaxy on Fedora
 
-- stage: Galaxy_Fedora_Latest
+- stage: galaxy_fedora_latest_ansible_2_16
   dependsOn: []
   jobs:
   - template: templates/group_tests.yml
     parameters:
       build_number: $(Build.BuildNumber)
       distro: fedora-latest
-      ansible_version: "-core >=2.16,<2.17"
+      ansible_version: ${{ variables.ansible_version }}
       skip_git_test: true
       test_galaxy: true
 
-# CentOS 9 Stream
+# CentOS 8 Stream, latest supported Ansible version.
 
-- stage: CentOS_9_Stream
-  dependsOn: []
-  jobs:
-  - template: templates/group_tests.yml
-    parameters:
-      build_number: $(Build.BuildNumber)
-      distro: c9s
-      ansible_version: "-core >=2.16,<2.17"
-      skip_git_test: true
-
-# CentOS 8 Stream
-
-- stage: CentOS_8_Stream
+- stage: c8s_ansible_2_16
   dependsOn: []
   jobs:
   - template: templates/group_tests.yml