automation: automatically build pre-release RPMs

Into https://copr.fedorainfracloud.org/coprs/g/rpm-software-management/tito/

.packit.yml

@@ -1,9 +1,17 @@
 ---
 jobs:
-  - job: copr_build
+  - &copr
+    job: copr_build
     trigger: pull_request
     metadata:
       targets:
         - fedora-all
         - epel-7-x86_64
         - epel-8-x86_64
+
+  - <<: *copr
+    trigger: commit
+    metadata:
+      owner: "@rpm-software-management"
+      project: "tito"
+      branch: master

README.md

@@ -26,6 +26,11 @@ Tito offers the following features:
  - Manage all of the above for a git repository with many disjoint packages
    within it.
 
+STATUS
+======
+
+Copr build: [![badge](https://copr.fedorainfracloud.org/coprs/g/copr/copr/package/copr-frontend/status_image/last_build.png)](https://copr.fedorainfracloud.org/coprs/g/rpm-software-management/tito/package/tito/)
+
 RELATED PROJECTS
 ================
 
@@ -51,6 +56,11 @@ From [PyPI](https://pypi.org/project/tito/):
 
     pip install tito
 
+[Pre-release versions for Fedora](https://copr.fedorainfracloud.org/coprs/g/rpm-software-management/tito/) (built from git `master` branch):
+
+    dnf copr enable @rpm-software-management/tito
+    dnf install tito
+
 From git's `master` branch:
 
 - First install Tito's dependencies for your architecture, i.e. `x86_64`: