run_batch_script.yml: Split error checking into multiple steps

This will improve debugging, so that we can see what step actually fails. Also, by splitting
up the steps, we can continue to the next step on failure of an earlier step thanks to
"if: always()".

.github/workflows/run_batch_script.yml

@@ -62,10 +62,26 @@ jobs:
             fi
         done
 
-    - name: Check that script executed without error
+    - name: Check results (no error logs)
+      if: always()
       run: |
         cd "${{ github.event.repository.name }}/multi_subject/output/log"
         [ "$(compgen -G "process_data_sub-0*.log")" ]        # Log files should exist
+
+    - name: Check results (no error logs)
+      if: always()
+      run: |
+        cd "${{ github.event.repository.name }}/multi_subject/output/log"
         [ ! "$(compgen -G "err.process_data_sub-0*.log")" ]  # Error files should NOT exist
+
+    - name: Check results (warnings in log)
+      if: always()
+      run: |
+        cd "${{ github.event.repository.name }}/multi_subject/output/log"
         # grep -iF "warning" process_data_sub-01.log
+
+    - name: Check results (errors in log)
+      if: always()
+      run: |
+        cd "${{ github.event.repository.name }}/multi_subject/output/log"
         grep -iF "error" process_data_sub-01.log