cpp tests not run on ci

**Description**
Only the python tests are run on CI. As a result, the tests are broken.

**To Reproduce**
- checkout repo
- run `cmake -S. -Bbuild -DMINORMINER_BUILD_TESTS=ON`
- run `cmake --build build`

**Expected behavior**
```
> cmake --build build
[ 12%] Building CXX object googletest-build/googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o
In file included from .../minorminer/build/googletest-src/googletest/src/gtest-all.cc:42:
.../minorminer/build/googletest-src/googletest/src/gtest-death-test.cc: In function ‘bool testing::internal::StackGrowsDown()’:
.../minorminer/build/googletest-src/googletest/src/gtest-death-test.cc:1301:24: error: ‘dummy’ may be used uninitialized [-Werror=maybe-uninitialized]
1301 | StackLowerThanAddress(&dummy, &result);
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
.../minorminer/build/googletest-src/googletest/src/gtest-death-test.cc:1290:13: note: by argument 1 of type ‘const void*’ to ‘void testing::internal::StackLowerThanAddress(const void*, bool*)’ declared here
1290 | static void StackLowerThanAddress(const void* ptr, bool* result) {
| ^~~~~~~~~~~~~~~~~~~~~
.../minorminer/build/googletest-src/googletest/src/gtest-death-test.cc:1299:7: note: ‘dummy’ declared here
1299 | int dummy;
| ^~~~~
cc1plus: all warnings being treated as errors
gmake[2]: *** [googletest-build/googletest/CMakeFiles/gtest.dir/build.make:79: googletest-build/googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:236: googletest-build/googletest/CMakeFiles/gtest.dir/all] Error 2
gmake: *** [Makefile:146: all] Error 2
```

**Environment:**
- OS: [Ubuntu 24.10 ]

**Additional context**
I tried disabing werror in google-test, and tests still failed due to a missing `` include.