Run upgrade.sh without database changes

[PieterL75]

NetBox version

v4.0.8

Feature type

Change to existing functionality

Proposed functionality

When an instance of NetBox is set to 'readonly', then the upgrade.sh should not perform any write operations to the database.
This can be either done by an 'option' (./upgrade.sh readony) or by a setting in the configuration.py that is read out.

Use case

I have 2 instances of my netbox running. One production with a write-enabled database and one for DR.
The database is replicated using postgres WAL into the DR location.
There the database is readonly for NetBox.

When I want upgrade the DR instance, I have to modify the upgrade.sh, so that all database commands are excluded (migrations, trace_paths, reindex, clearsessions, clearcache).

Database changes

No response

External dependencies

No response

[jeremystretch]

If the replicated copy of the database is up-to-date, running upgrade.sh against it should have no effect; it would be the same as running upgrade.sh multiple times against the same database.

[PieterL75]

The problem here, is that de postgres database is in readonly state. the upgrade script fails on that

[jeremystretch]

Marking this as "needs owner" with the caveat that it must be implemented as a command line argument to the script.