Install time featurettes [umask and --readonly switch (unrelated items)]

[jconroy42]

Hi

I'm not sure if this is the correct place to be logging these two items so apologies if it isn't.
I came across two minor issues during some recent Netbox installations on RedHat RHEL 9.4.

The first related to the build of Linux that we have having had a variety of hardening measures applied. One of these was a system-wide umask setting of 0027 rather than 0022.
This does not highlight itself as an issue until attempting to start Netbox properly.
A umask setting of 0027 causes all installed files to not be world readable.
It would be worth updating the install guide (https://netboxlabs.com/docs/netbox/installation/) to ensure that installers confirm that "umask 0022" is set prior to installation.

The second issue related to performing an HA installation against a clustered PostgreSQL database. On the face of it the "-readonly" switch should avoid attempting to install/update the database schema a second time during the installation of the secondary Netbox instance.
However whilst this is true, using the "-readonly" flag also curtails a later part of the basic code installation. I circumvented this by commenting out the database update line in the installer and reverting it later.
The long term fix would be to ensure that "-readonly" doesn't cause the install script to exit but to simply step over the DB schema upgrade line.

Thanks for a great product

John