Add label generation checking

Closes https://git.autonomic.zone/coop-cloud/abra/issues/186.

abra

@@ -2283,6 +2283,11 @@ sub_recipe_release() {
     error "Hmm, something went wrong generating a new version number.."
   fi
 
+  local -a expected_format="^coop-cloud.[a-z]*.[a-z]*.[a-z]*=v\\d*.\\d*.\\d*-\\S{8}"
+  if [[ ! "$new_version" =~ $expected_format ]]; then
+    error "'$new_version' does not match the expected label format, bailing out..."
+  fi
+
   success "All compose files updated; new version is $new_version"
 
   if [ "$abra___no_prompt" = "false" ] && [ "$bump" = "false" ]; then