Packit: split out ELN jobs and reuse fedora downstream targets

ELN is kind of a midway between Fedora and RHEL, so it's best to mention
ELN jobs separately. This will also allow reusing fedora targets using
YAML anchors for TMT tests.

This commit also mentions fedora-40 targets separately for copr_build
jobs so that once fedora-41 is released, fedora-40 jobs continue to
trigger.

Signed-off-by: Lokesh Mandvekar <lsm5@fedoraproject.org>

.packit.yaml

@@ -14,6 +14,8 @@ packages:
     specfile_path: rpm/buildah.spec
   buildah-rhel:
     specfile_path: rpm/buildah.spec
+  buildah-eln:
+    specfile_path: rpm/buildah.spec
 
 srpm_build_deps:
   - make
@@ -26,12 +28,21 @@ jobs:
       failure_comment:
         message: "Ephemeral COPR build failed. @containers/packit-build please check."
     targets:
-      fedora-development-x86_64: {}
-      fedora-development-aarch64: {}
-      fedora-latest-x86_64: {}
-      fedora-latest-aarch64: {}
-      fedora-latest-stable-x86_64: {}
-      fedora-latest-stable-aarch64: {}
+      - fedora-development-x86_64
+      - fedora-development-aarch64
+      - fedora-latest-x86_64
+      - fedora-latest-aarch64
+      - fedora-latest-stable-x86_64
+      - fedora-latest-stable-aarch64
+      - fedora-40-x86_64
+      - fedora-40-aarch64
+    enable_net: true
+
+  - job: copr_build
+    trigger: pull_request
+    packages: [buildah-eln]
+    notifications: *copr_build_failure_notification
+    targets:
       fedora-eln-x86_64:
         additional_repos:
           - "https://kojipkgs.fedoraproject.org/repos/eln-build/latest/x86_64/"
@@ -78,7 +89,7 @@ jobs:
     trigger: release
     packages: [buildah-fedora]
     update_release: false
-    dist_git_branches:
+    dist_git_branches: &fedora_targets
       - fedora-all
 
   # Sync to CentOS Stream
@@ -98,5 +109,4 @@ jobs:
     # Ref: https://packit.dev/docs/fedora-releases-guide/releasing-multiple-packages
     dependents:
       - podman
-    dist_git_branches:
-      - fedora-all
+    dist_git_branches: *fedora_targets