Update Jenkinsfile, use agent struct

Author: AnastaZIuk

Jenkinsfile

@@ -1,11 +1,11 @@
 stage('CMake')
 {
-	  bat returnStatus: true, script: "cmake -DNBL_COMPILE_WITH_CUDA:BOOL=ON -DNBL_BUILD_OPTIX:BOOL=ON -DNBL_BUILD_MITSUBA_LOADER:BOOL=ON -DNBL_BUILD_RADEON_RAYS:BOOL=ON -DNBL_RUN_TESTS:BOOL=ON -S ./ -B ./build -T v143"
-	  bat "git -C ./3rdparty/gli reset --hard" // due to gli build system bug
-	  bat "cmake -DNBL_COMPILE_WITH_CUDA:BOOL=ON -DNBL_BUILD_OPTIX:BOOL=ON -DNBL_BUILD_MITSUBA_LOADER:BOOL=ON -DNBL_BUILD_RADEON_RAYS:BOOL=ON -DNBL_RUN_TESTS:BOOL=ON -S ./ -B ./build -T v143"
+	  agent.execute("cmake -DNBL_COMPILE_WITH_CUDA:BOOL=ON -DNBL_BUILD_OPTIX:BOOL=ON -DNBL_BUILD_MITSUBA_LOADER:BOOL=ON -DNBL_BUILD_RADEON_RAYS:BOOL=ON -DNBL_RUN_TESTS:BOOL=ON -S ./ -B ./build -T v143", true)
+	  agent.execute("git -C ./3rdparty/gli reset --hard") // due to gli build system bug
+	  agent.execute("cmake -DNBL_COMPILE_WITH_CUDA:BOOL=ON -DNBL_BUILD_OPTIX:BOOL=ON -DNBL_BUILD_MITSUBA_LOADER:BOOL=ON -DNBL_BUILD_RADEON_RAYS:BOOL=ON -DNBL_RUN_TESTS:BOOL=ON -S ./ -B ./build -T v143")
 }
 
 stage('Compile Nabla')
 {
-	  bat "cmake --build ./build --target Nabla --config Release -j12 -v"
+	  agent.execute("cmake --build ./build --target Nabla --config Release -j12 -v")
 }