/usr/share/drbl/postrun/ocs/00-readme.txt is in clonezilla 3.21.13-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # The scripts in this direcoty will be run by run-parts comamnd AFTER ocs-sr starts.
# //NOTE//:
# (1) You need to enable the option "-o1" otherwise it won't work.
# (2) The scripts here is nothing to do with the option "-p" or "--postaction" of ocs-sr, and they will be run before that assigned in -p or --postaction."
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