fix syntax warning

Author: chingor13

monorepo-migration/migrate.sh

@@ -379,7 +379,7 @@ if [ -d "$SOURCE_REPO_NAME/.github/workflows" ]; then
         if [ -f "$workflow" ]; then
             filename=$(basename "$workflow")
 
-            if [ "${filename}" == "ci.yaml" && "${SKIP_CI_WORKFLOW}" == "true" ]; then
+            if [[ "${filename}" == "ci.yaml" && "${SKIP_CI_WORKFLOW}" == "true" ]]; then
                 echo "Skipping ci.yaml workflow as requested by user"
                 continue
             fi