5c0e42e1cb
There are some cases where there is a complex hosting strategy and folks want a readonly database and are hosting on Azure. In that case, it is not entirely possible to have a readonly Umbraco database because SqlMainDom is required and part of that requirement is to have read/write access to the umbraco key value table.
This PR allows for the default MainDom to be replaced and to allow for an SqlMainDomLock to use an alternate connection string so that a separate read/write database can be used.
(cherry picked from commit 9f48a9f940)
Umbraco CMS · 
Umbraco is the friendliest, most flexible and fastest growing ASP.NET CMS, and used by more than 500,000 websites worldwide. Our mission is to help you deliver delightful digital experiences by making Umbraco friendly, simpler and social.
Learn more at umbraco.com
See the official Umbraco website for an introduction, core mission and values of the product and team behind it.
Please also see our Code of Conduct.
Getting Started
Umbraco Cloud is the easiest and fastest way to use Umbraco yet, with full support for all your custom .NET code and integrations. You're up and running in less than a minute, and your life will be made easier with automated upgrades and a built-in deployment engine. We offer a free 14-day trial, no credit card needed.
If you want to DIY, then you can download Umbraco either as a ZIP file or via NuGet. It's the same version of Umbraco CMS that powers Umbraco Cloud, but you'll need to find a place to host it yourself, and handling deployments and upgrades will be all up to you.
Documentation
The documentation for Umbraco CMS can be found on Our Umbraco. The source for the Umbraco docs is open source as well and we're happy to look at your documentation contributions.
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