Fix STAGE deteciton command

Author: ia3andy

deploy/build_deploy.sh

@@ -9,7 +9,7 @@ IMAGE_TAG=${IMAGE_TAG-$GIT_REV_SHORT}
 
 STAGE=false
 
-if [[ $(git --no-pager  log --oneline -1) == *[STAGE]* ]]; then
+if git --no-pager log -1 --format='%h %s' | grep -Fq '[STAGE]'; then
   echo "This commit is flagged with [STAGE] and won't go to production"
   STAGE=true
 fi