[CI] Coverity missing flag during CMake build

Author: KFilipek

.github/workflows/coverity.yml

@@ -43,6 +43,7 @@ jobs:
         -DCMAKE_BUILD_TYPE=Release
         -DUMF_FORMAT_CODE_STYLE=OFF
         -DUMF_DEVELOPER_MODE=OFF
+        -DUMF_TESTS_FAIL_ON_SKIP=ON
         -DUMF_BUILD_LIBUMF_POOL_SCALABLE=ON
         -DUMF_BUILD_LIBUMF_POOL_DISJOINT=ON
         -DUMF_BUILD_LIBUMF_POOL_JEMALLOC=ON