add packit

.packit.yaml

@@ -0,0 +1,31 @@
+# we have the specfile in the root of our repository
+specfile_path: golang-github-osbuild-composer.spec
+# when doing an update in Fedora, we want to copy the spec file and the config file
+synced_files:
+  - osbuild.spec
+  - .packit.yaml
+upstream_package_name: osbuild-composer
+downstream_package_name: golang-github-osbuild-composer
+jobs:
+  # trigger a COPR build for push events in open PRs
+  - job: copr_build
+    trigger: pull_request
+    metadata:
+      targets:
+        - fedora-31-x86_64
+        - fedora-rawhide-x86_64
+  # this is triggered by a commit on src.fedoraproject.org, not Github!
+  # e.g. in case of mass rebuild or automated changes of spec file (e.g. Python packagers)
+  # it will create a PR on Github with changes in synchronized files
+  - job: sync_from_downstream
+    trigger: commit
+  # create a PR on src.fedoraproject.org containing updated spec file and new sources (tarball)
+  # triggered by Github release
+  - job: propose_downstream
+    trigger: release
+    metadata:
+      dist-git-branch: master
+  - job: propose_downstream
+    trigger: release
+    metadata:
+      dist-git-branch: f31