add .packit support

.packit.yaml

@@ -0,0 +1,26 @@
+# See the documentation for more information:
+# https://packit.dev/docs/configuration/
+actions:
+    post-upstream-clone:
+        - "wget https://src.fedoraproject.org/rpms/butane/blob/rawhide/f/butane.spec -O butane.spec"
+
+specfile_path: butane.spec
+
+# add or remove files that should be synced
+files_to_sync:
+    - butane.spec
+
+upstream_tag_template: v{version}
+
+# name in upstream package repository or registry (e.g. in PyPI)
+upstream_package_name: butane
+# downstream (Fedora) RPM package name
+downstream_package_name: butane
+
+jobs:
+
+- job: propose_downstream
+  trigger: release
+  dist_git_branches:
+    - fedora-rawhide
+    - fedora-stable