/usr/share/click/hooks/webapp-container.hook is in webapp-container 0.23+16.04.20160413-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | Pattern: ${home}/.local/share/webapp-container/${id}.webapp
Exec: /usr/bin/webapp-container-hook
User-Level: yes
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