Add ocean post to archive dependencies (#949)

The archive job was not waiting for ocean post to complete because
there was no dependency.

Fixes #948

workflow/rocoto/workflow_tasks.py

@@ -905,6 +905,9 @@ def arch(self):
             if self.app_config.do_wave_bnd:
                 dep_dict = {'type': 'task', 'name': f'{self.cdump}wavepostbndpnt'}
                 deps.append(rocoto.add_dependency(dep_dict))
+        if self.app_config.do_ocean:
+            dep_dict = {'type': 'metatask', 'name': f'{self.cdump}ocnpost'}
+            deps.append(rocoto.add_dependency(dep_dict))
         dependencies = rocoto.create_dependency(dep_condition='and', dep=deps)
 
         resources = self.get_resource('arch')