ci: push-containers: trigger job on release branching

Currently all 23.05 related CI jobs are failing as the containers are
not available, so lets fix it by pushing those containers when the
version.mk changes.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

.github/workflows/push-containers.yml

@@ -3,6 +3,7 @@ name: Build and Push prebuilt tools container
 on:
   push:
     paths:
+      - 'include/version.mk'
       - 'tools/**'
       - '.github/workflows/build-tools.yml'
       - '.github/workflows/push-containers.yml'