Different syntax for excluding tests in ci

Author: iainrussell

.github/ci-config.yml

@@ -1,9 +1,5 @@
 cmake_options: -DENABLE_ALL_TESTS=ON -DBOOST_ROOT=${BOOST_ROOT_DIR} -DBOOST_INCLUDEDIR=${BOOST_INCLUDE_DIR} -DBOOST_LIBRARYDIR=${BOOST_LIB_DIR} -DOPENSSL_ROOT_DIR=${OPENSSL_ROOT_DIR} -DENABLE_STATIC_BOOST_LIBS=OFF
-ctest_options: 
-  - -L
-  - nightly
-  - -E
-  - s_test|s_zombies
+ctest_options: -L nightly -E s_test|s_zombies
 dependencies: |
   ecmwf/ecbuild
 dependency_branch: develop