adding Docker Container, test 4:cat1-testcli.cwl

Author: kapilkd13

v1.0/v1.0/cat1-testcli.cwl

@@ -3,6 +3,12 @@
     "class": "CommandLineTool",
     "cwlVersion": "v1.0",
     "doc": "Print the contents of a file to stdout using 'cat' running in a docker container.",
+    "hints": [
+        {
+            "class": "DockerRequirement",
+            "dockerPull": "python:2-slim"
+        }
+    ],
     "inputs": [
         {
             "id": "file1",