Add 'Building Windows Installer' instruction to online manual

Description

Since release 2.15.2 it's no longer possible to create Windows Installer using the release pipeline, as the server needed to build these has crashed along with the certificate needed to sign the installer.

As a workaround, we can create an instruction to let the users build a Windows Installer themselves.

Historically there already was an instruction for building the installer manually, so that could easily be used (as it's still valid):
https://github.com/geoserver/geoserver/blob/b8ce783fdb2802defd7dd604d494405b16fa4533/doc/en/developer/source/release-guide/index.rst#build-windows-installer

Environment

Browser

Status

Assignee

Unassigned

Reporter

Ronald Hoek

Triage

Fix versions

Affects versions

2.16.1
2.15.2
2.16.0
2.16-RC

Components

Priority

Medium
Configure