fix: Stringop overread warning in GCC12 (#2407)

This showed up in our GCC12 based LCG builds, and only in Release mode. I don't think there's a way for us to fix this because the warning actually comes from `std::move`'ing `boost::small_vectors`. I'm suppressing the warnings here and remove the job from being allowed to fail.

.gitlab-ci.yml

@@ -446,10 +446,9 @@ lcg_103:
       - OS: [alma9]
         COMPILER: 
           - gcc11
-          # currently failing
-          # - gcc12
+          - gcc12
 
   rules:
-    - if: '$COMPILER == "clang12" || $COMPILER == "gcc12" || $COMPILER == "clang15"'
+    - if: '$COMPILER == "clang12" || $COMPILER == "clang15"'
       allow_failure: true
     - when: on_success

Core/include/Acts/Seeding/BinnedSPGroup.ipp

@@ -74,7 +74,16 @@ Acts::BinnedSPGroupIterator<external_spacepoint_t>::operator*() const {
           m_group->m_bins[m_current_localBins[INDEX::Z]],
           m_group->m_grid.get());
 
+  // GCC12+ in Release throws an overread warning here due to the move.
+  // This is from inside boost code, so best we can do is to suppress it.
+#if defined(__GNUC__) && __GNUC__ >= 12 && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-overread"
+#endif
   return std::make_tuple(std::move(bottoms), global_index, std::move(tops));
+#if defined(__GNUC__) && __GNUC__ >= 12 && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
 }
 
 template <typename external_spacepoint_t>