Test and verify docker images

Docker images: 

For each platform, check that 

• Image is usable with Docker 
• Image is usable with Qt creator 

In general check that 

• Pipeline builds the image 
• A published version of the image is in JFrog 
• All necessary variables are exposed inside the container 
• Example project exists for the image, and is built with a pipeline 
• Documentation exists for image, also in Confluence and customer-facing (dashboard plugin) 

This should be done to ALL images (Host (linux) Qt, all Android ABIs, Qt+WASM, Boot2Qt)

Eventually, current `develop` -branch should become the `main`.