Run 2 threads for release raft builds (#822)

Author: ashamis

cmake/common.cmake

@@ -386,7 +386,12 @@ else()
   set(CONSENSUS_ARG "raft")
 endif()
 
-set(WORKER_THREADS 0)
+if((NOT CMAKE_BUILD_TYPE STREQUAL "Debug") AND NOT PBFT)
+  set(WORKER_THREADS 2)
+else()
+  set(WORKER_THREADS 0)
+endif()
+message(STATUS "Setting default WORKER_THREADS to '${WORKER_THREADS}'")
 
 set(CCF_NETWORK_TEST_ARGS
     ${TEST_IGNORE_QUOTE}