I need to have a new customized field, type 'select list'. The options must be the values in this field from other issues. Also we want the option for the user to add new values as options in this select lst.
That's going to require an add-on for a new field type.
It's also going to be quite a hard one - the baseline select list is a set of options in a llist set by the admins. You're asking for a dynamic recursive list where the option list is drawn from existing issues, and of course, the ability to add ad-hoc ones (without being an admin and doing it from the interface).
However, what you are asking for is pretty much a "labels" field. It's not a drop-down, by it will suggest existing entries as people type. That's probably a far better option than writing a new field type.
Not one that does it the way you describe.
There is another option. With the ScriptRunner add-on, you can create "Behaviours". To get close to what you want:
For bonus points, you could write a script that says "when a developer accepts an issue with a new error logged, automatically add it to the options in the select list"
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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