feat(cli): add a captain-update script to generate a report of all applications to update

README.md

@@ -1,3 +1,18 @@
 # Tools
 
-Tools allowing to keep sans.pub up-to-date and automate common recurring actions.
+Tools allowing to keep sans.pub up-to-date and automate common recurring actions.
+
+## `captain-update.mjs`
+
+Allow to generate a report of all versions of applications deployed on sans.pub, with the current status of each application and whether they need an update or not.
+
+It can serve as a base for a changelog entry, and as a TODO list for updating applications.
+
+Example:
+```shell
+CAPTAIN_DOMAIN=xxxx CAPTAIN_PASSWORD='yyy' ./captain-update.mjs > /path/to/site/src/changelog/2023-05-08.md
+```
+
+### TODO
+
+- [ ] try to update applications automatically from a prompt