#3060: comment out install image hash

Author: mo-tgeddes

esmvaltool/utils/recipe_test_workflow/recipe_test_workflow/app/install_cold/bin/install_cold.sh

@@ -34,4 +34,4 @@ git clone -q -b "${BRANCH}" "${ESMVALCORE_URL}" "${ESMVALCORE_DIR}"
 
 # Manually and temporarily install imagehash (it will be included in the
 # next ESMValTool community environment).
-rtw-env pip install imagehash -t "${CYLC_WORKFLOW_RUN_DIR}/lib/python"
+#rtw-env pip install imagehash -t "${CYLC_WORKFLOW_RUN_DIR}/lib/python"