Automatic screenshot generation (tracker issue)

[teolemon]

What

• Create a GitHub Action to run screenshot generation and upload the output to the OFF server (or somewhere else) #914
• Fix the "Scan screenshot" generation
  • Add a way to set the background of the barcode scanner with an arbitrary image, per country
• Fix the "History screenshot" population with products #915
• Add the proposed fix to clean the top bar with 100% battery, and an arbitrary time of day #916
• Add fastlane frameit to the Fastlane file, so that we can get versions wrapped in physical devices
• Fix Chinese screenshot generation #917
• Ensure we can generate for 1 of (iPhone 11 Pro Max, iPhone 11, iPhone XS Max, iPhone XR), 1 of (iPhone 6s Plus, iPhone 7 Plus, iPhone 8 Plus), 1 of (3rd generation iPad Pro)
• Extra: For debugging purposes, it would be great to have other screen resolutions (iPhone 11 Pro, iPhone X, iPhone XS) (iPhone 6, iPhone 6s, iPhone 7, iPhone 8) (iPhone SE) (iPhone 4s)
• The screenshot generation produces empty screenshots #893

Part of

• What can I work on ? (Tracker issue) #912