Re: Add support for EXTRA_REGRESS_OPTS for meson

> > in addition to the above, might be worth to add some documentation like
> > 
> > Environment Variables Supported:
> > EXTRA_REGRESS_OPTS: Additional options to pass to regression, isolation, or ecpg tests.
> > TEMP_CONFIG: Specify a temporary configuration file for testing purposes.
> > Example Usage:
> > # Use EXTRA_REGRESS_OPTS to load an extension
> >    EXTRA_REGRESS_OPTS="--load-extension=pgcrypto" meson test
> > # Use TEMP_CONFIG to specify a temporary configuration file
> >    TEMP_CONFIG="path/to/test.conf" meson test
> > # Use both EXTRA_REGRESS_OPTS and TEMP_CONFIG together
> >    TEMP_CONFIG="path/to/test.conf" EXTRA_REGRESS_OPTS="--load-extension=pgcrypto" meson test
> 
> Yeah, we probably should. But not sure where, maybe at 
> https://www.postgresql.org/docs/current/install-meson.html or did you 
> imagine somewhere else?

Either at docs or/and directly in file /src/tools/testwrap as comments
Regards.