Improve manifest.json to dynamicly add values
## Summary We now have a `manifest.json` (rendered through https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/views/pwa/manifest.json.erb) and are one step closer to the PWA, great! In our opinion, the `manifest.json` could be improved by using the instance settings instead of hard-coded values. ## Improvements Lets create pwa attributes in appearance. Those attributes can be set via api or gui. The attributes are loaded into the `manifest.json` Attributes: - `pwa_name` used for manifest.json field `name` - `pwa_short_name` used for manifest.json field `short_name` - `pwa_description` used for manifest.json field `description` - `pwa_icon` used for manifest.json field `icons` (array with icon in different sizes) For this we need: - add attributes to appearance (database / model) - Make them accessible via api or gui (controller) - render icon in different sizes - Update Appearance GUI with the new attributes ## Risks None that I know of ## Involved components - manifest.json - Admin > Appearance page - Appearance controller - Appearance API :tools: with :heart: at Siemens
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