Adding environment interpolation for noop, forking, and slurm executors

libdaggy/tests/CMakeLists.txt

@@ -7,6 +7,7 @@ add_executable(${PROJECT_NAME} main.cpp
         unit_dagrun_loggers.cpp
         unit_executor_forkingexecutor.cpp
         unit_executor_slurmexecutor.cpp
+        unit_executor_noopexecutor.cpp
         unit_serialization.cpp
         unit_threadpool.cpp
         unit_utilities.cpp