add packit config for packaging CI (facebook#1732)

Summary:
Pull Request resolved: facebook#1732

Configure so every tag triggers a build on Fedora and EPEL

Reviewed By: davide125

Differential Revision: D34725075

fbshipit-source-id: 63f866482f72710b4710ef3449215dfcbbea4782

.packit.yaml

@@ -0,0 +1,37 @@
+# See the documentation for more information:
+# https://packit.dev/docs/configuration
+
+specfile_path: folly.spec
+
+upstream_package_name: folly
+downstream_package_name: folly
+
+actions:
+  post-upstream-clone: "bash -c \"git clone -b packit https://pagure.io/meta/folly.git folly-dist-git && mv folly-dist-git/folly*.{spec,patch} .\""
+
+jobs:
+- job: copr_build
+  trigger: pull_request
+  metadata:
+    targets:
+    - fedora-development-aarch64
+    - fedora-development-armhfp
+    - fedora-development-i386
+    - fedora-development-x86_64
+    - fedora-35-aarch64
+    - fedora-35-armhfp
+    - fedora-35-i386
+    - fedora-35-x86_64
+
+- job: copr_build
+  trigger: release
+  metadata:
+    targets:
+    - fedora-development-aarch64
+    - fedora-development-armhfp
+    - fedora-development-i386
+    - fedora-development-x86_64
+    - fedora-35-aarch64
+    - fedora-35-armhfp
+    - fedora-35-i386
+    - fedora-35-x86_64