Update int.cloudbuild.yaml

Author: apeabody

build/int.cloudbuild.yaml

@@ -37,7 +37,7 @@ steps:
       # Do not prune if changing tests themselves
       _INFRA_FOLDERS="build test .github"
       while read d; do
-        echo "${d%/}"
+        echo "$d%/"
         if [[ "${_INFRA_FOLDERS}" =~ "$d%/" ]]; then
           echo "Infrastructure folder $d%/ has changed; no tests will be pruned."
           exit 0 # do not prune