ci: Get version for packit from the SPEC file

Default is using the latest tag which might be different (e.g. for
a stable release, not for the latest one).

.packit.yaml

@@ -8,6 +8,8 @@ actions:
     - 'make'
     - 'make local'
     - 'bash -c "ls *.tar*"'
+  get-current-version:
+    - 'bash -c "grep Version: dist/libblockdev.spec.in | cut -f2 -d\":\" | tr -d \" \""'
 
 jobs:
 - job: copr_build
@@ -42,6 +44,8 @@ jobs:
       - 'make'
       - 'make local'
       - 'bash -c "ls *.tar*"'
+    get-current-version:
+      - 'bash -c "grep Version: dist/libblockdev.spec.in | cut -f2 -d\":\" | tr -d \" \""'
 
 - job: copr_build
   trigger: commit
@@ -61,6 +65,8 @@ jobs:
       - 'make'
       - 'make local'
       - 'bash -c "ls *.tar*"'
+    get-current-version:
+      - 'bash -c "grep Version: dist/libblockdev.spec.in | cut -f2 -d\":\" | tr -d \" \""'
 
 - job: propose_downstream
   trigger: release