Correct cmake build type for merge request

Use build type CONTINUOUS for merge requests such that the MR are shown in CDash
at the correct place.

CbmRoot_test.cmake

@@ -28,10 +28,12 @@ Else()
   Set(CTEST_USE_LAUNCHERS 1)
 EndIf()
 
-If(NOT $ENV{ctest_model} MATCHES Weekly)
-  String(TOUPPER $ENV{ctest_model} _Model)
-Else()
+If($ENV{ctest_model} MATCHES Weekly)
   Set(_Model PROFILE)
+ElseIf($ENV{ctest_model} MATCHES MergeRequest)
+  Set(_Model CONTINUOUS)
+Else()
+  String(TOUPPER $ENV{ctest_model} _Model)
 EndIf()
 
 If(EXTRA_FLAGS)