Refactor the remaining logic from gulp. Part of the browser build script
refactor effort.
Webpack is now responsible for performing most of the operations previously
done by gulp. This includes: - Setting browser specific class - Building the
manifest file The `package.json` is modified to include browser specific
commands for `build`, `build:prod`, `build:watch` and `dist`.
# Manifests
Manifests now uses the `copy-webpack-plugin` `transform` feature. The logic is
located in `apps/browser/webpack/manifest.js`. It reads a template, which
supports some basic operations primarily overriding with browser specific
fields using `__browser__`. The `manifest.json` for both regular and mv3
builds are identical to our existing manifests except:
- `applications` renamed to `browser_specific_settings`.
- `permissions` sorted alphabetically.
# Safari build
Safari requires additional packaging commands. This is implemented as a
powershell script due to the cross-platform nature, and since we generally
require powershell in our distribution pipelines. An alternative would be to
write it in bash, but bash is less powerful and would require some additional
commands like `jq`. Another alternative is to write it using js, but that would
require additional dependencies.
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