Make dppp step optional, depending on whether the data was already compressed

This MR aims to skip the dppp dysco compression if the data was already dysco compressed. Relies on ldv-images!2 (merged) for reading out the storage manager.

steps/identify_issues.cwl

@@ -48,6 +48,12 @@ outputs:
     glob: output.txt
     outputEval: $(JSON.parse(self[0].contents)['skip_compress'])
     loadContents: true
+- id: input_storage_manager
+  type: string
+  outputBinding:
+    glob: output.txt
+    outputEval: $(JSON.parse(self[0].contents)['input_storage_manager'])
+    loadContents: true
 - id: msout
   type: Directory
   outputBinding: