Add packit job to run ABI check plan on testing farm

The plan: rpm-software-management/ci-dnf-stack#1595

Since the plan compares ABI with latests rawhide build target the job only
to rawhide.

.packit.yaml

@@ -120,3 +120,12 @@ jobs:
       get-current-version:
         - bash -c 'rpmspec -q --queryformat "%{VERSION}\n" dnf5.spec | head -n1'
     packages: [dnf5-without-modules]
+  - job: tests
+    trigger: pull_request
+    identifier: "ABI-check"
+    targets:
+      - fedora-rawhide-x86_64
+    fmf_url: https://github.com/rpm-software-management/ci-dnf-stack.git
+    fmf_ref: main
+    tmt_plan: "^/plans/integration/abi-libdnf5$"
+    packages: [dnf5]