Enhancements for containerised host toolchain

What is the benefit? Why is this valuable?
A number of enhancements to the current base have been identified:
-Docker registry to provide the toolchain container from there, also to sync with CI cloud
-Command line usage of embedded toolchains
-QBSP receipes for container-based toolchains so that user can choose between containerised and local approach
-Filtering in installer backend based on architecture

This work would come on top of the base functionality done in the embedded containerised toolchain
The linked ticket on containerised toolchains provides the base for these enhancements.
What are common use cases?
Embedded development using the Qt containerised toolchain for wider and easier platform reach.
Technical information
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