Configure clang-tidy job on CI (#6261)

include/guidance/motorway_handler.hpp

@@ -18,7 +18,7 @@ namespace guidance
 {
 
 // Intersection handlers deal with all issues related to intersections.
-class MotorwayHandler : public IntersectionHandler
+class MotorwayHandler final : public IntersectionHandler
 {
   public:
     MotorwayHandler(const util::NodeBasedDynamicGraph &node_based_graph,

include/guidance/roundabout_handler.hpp

@@ -35,7 +35,7 @@ struct RoundaboutFlags
 // The roundabout handler processes all roundabout related instructions.
 // It performs both the distinction between rotaries and roundabouts and
 // assigns appropriate entry/exit instructions.
-class RoundaboutHandler : public IntersectionHandler
+class RoundaboutHandler final : public IntersectionHandler
 {
   public:
     RoundaboutHandler(const util::NodeBasedDynamicGraph &node_based_graph,

include/guidance/turn_handler.hpp

@@ -23,7 +23,7 @@ namespace guidance
 {
 
 // Intersection handlers deal with all issues related to intersections.
-class TurnHandler : public IntersectionHandler
+class TurnHandler final : public IntersectionHandler
 {
   public:
     TurnHandler(const util::NodeBasedDynamicGraph &node_based_graph,