Optimized packit config.

- Use fedora-all instead of hardcoding version numbers.
- Get spec file from downstream, don't put it to the repo.
- Enable release-time downstream Fedora release.

.packit.yaml

@@ -3,12 +3,16 @@ jobs:
 - job: copr_build
   metadata:
     targets:
-    - fedora-30-x86_64
-    - fedora-31-x86_64
-    - fedora-rawhide-x86_64
+    - fedora-all-x86_64
   trigger: pull_request
+- job: propose_downstream
+  metadata:
+    dist-git-branch: fedora-all
+  trigger: release
 specfile_path: scap-workbench.spec
 synced_files:
 - scap-workbench.spec
 - .packit.yaml
 upstream_package_name: scap-workbench
+actions:
+  post-upstream-clone: wget -N https://src.fedoraproject.org/rpms/scap-workbench/blob/master/f/scap-workbench.spec