PWA feed functionnality

[Daddoon]

The main goal of this issue is to enhance the Blazor and BlazorMobile workflow in order to:

• Add a remotly controlled update workflow of an app
• Managed totally or partially by the PWA app format
• Make the workflow transparent.

Requirement:

• Application update workflow must be ATOMIC - The app must be downloaded completely before updating current revision
• Application PWA app package must be valided with a checksum from the source server
• Get a minimal offline working app in app even if there is not Internet for downloading updates (by Design)

Question:

• Can we use a regular compliant PWA technical scenario ? Like using remote server URL as launching URI instead of 127.0.0.1 internally ?
• If yes, is there any mecanism to cache another version of the app before updating as we want a minimal app available without internet.
• If no to previous questions, we may use the current app package format and executing locally the app, with some addition for validating the PWA app in the workflow.

Notes:

• If all ressources are availables and identified from Blazor PWA manifest we may try to download and validate the PWA app without any change to the server. This also mean the PWA app can be hosted on any various kind of server
• Otherwise, we may develop a ASP.NET Core extension, but it would make this functionnality less more universal.