Fix version generation for rust

Author: esensar

builder-support/gen-version

@@ -71,7 +71,7 @@ if [ ! -z "$(git rev-parse --abbrev-ref HEAD 2> /dev/null)" ]; then
     fi
   fi
 
-  VERSION="${LAST_TAG}.${COMMITS_SINCE_TAG}${BRANCH}.${GIT_HASH}${DIRTY}"
+  VERSION="${LAST_TAG}.${COMMITS_SINCE_TAG}-${BRANCH}.${GIT_HASH}${DIRTY}"
 fi
 
 printf $VERSION