packit: use identifers to distinguish copr_build jobs

Signed-off-by: the Mulhern <amulhern@amulhern.bos.csb>

Author: the Mulhern

.packit.yaml

@@ -41,11 +41,13 @@ srpm_build_deps:
 jobs:
   - job: copr_build
     trigger: pull_request
+    identifier: copr_pull
     targets:
       - fedora-all
 
   - job: copr_build
     trigger: commit
+    identifier: copr_commit
     targets:
       - fedora-all