feat: run integration tests in testing-farm

Extend the packit configuration to trigger tests on testing-farm after
the completion of the build jobs.

The tests are split for the different distributions supported; this is
due to the current limitation of testing-farm in the way additional
repositories can be supplied: as the name of a Fedora Copr repository
cannot be specified, each distribution needs to get the repository URL
for it.

Manually specify the RHEL targets/composes due to the limitations in the
packit<->testing-farm mapping of RHEL composes.

Signed-off-by: Pino Toscano <[email protected]>

.packit.yaml

@@ -26,3 +26,49 @@ jobs:
       - fedora-all
       - rhel-8
       - rhel-9
+
+  - job: tests
+    trigger: pull_request
+    identifier: "unit/centos-stream"
+    targets:
+      - centos-stream-8
+      - centos-stream-9
+    labels:
+      - unit
+    tf_extra_params:
+      environments:
+        - artifacts:
+            - type: repository-file
+              id: https://copr.fedorainfracloud.org/coprs/g/yggdrasil/latest/repo/centos-stream-$releasever/group_yggdrasil-latest-centos-stream-$releasever.repo
+
+  - job: tests
+    trigger: pull_request
+    identifier: "unit/fedora"
+    targets:
+      - fedora-all
+    labels:
+      - unit
+    tf_extra_params:
+      environments:
+        - artifacts:
+            - type: repository-file
+              id: https://copr.fedorainfracloud.org/coprs/g/yggdrasil/latest/repo/fedora-$releasever/group_yggdrasil-latest-fedora-$releasever.repo
+
+  - job: tests
+    trigger: pull_request
+    identifier: "unit/rhel"
+    targets:
+      rhel-8-x86_64:
+        distros:
+          - RHEL-8-Released
+      rhel-9-x86_64:
+        distros:
+          - RHEL-9.4.0-Nightly
+    labels:
+      - unit
+    tf_extra_params:
+      environments:
+        - artifacts:
+            - type: repository-file
+              id: https://copr.fedorainfracloud.org/coprs/g/yggdrasil/latest/repo/rhel-$releasever/group_yggdrasil-latest-rhel-$releasever.repo
+    use_internal_tf: true