updated check_shell_syntax.sh

check_shell_syntax.sh

@@ -31,7 +31,10 @@ section "Shell Syntax Checks"
 start_time="$(start_timer)"
 
 for x in $(find -L "${1:-.}" -type f -iname '*.sh'); do
+    # expensive call shouldn't be needed when running from a fresh git checkout in CI
+    if ! is_CI; then
         isExcluded "$x" && continue
+    fi
     echo -n "checking shell syntax: $x"
     bash -n "$x"
     echo " => OK"