Added Safari Extension Build Script (#23)

Author: Camji55

.gitignore

@@ -1,4 +1,5 @@
 *.log
 dist
 gitpod.xpi
-node_modules
+node_modules
+Gitpod

README.md

@@ -7,14 +7,39 @@ This is the browser extension for Gitpod. It supports Chrome (see [Chrome Web St
 
 ## Build
 
+### Chrome & Firefox
+
+```
+yarn install && yarn build && yarn package
+```
+
+### Safari
+
+#### ⚠️ A machine running macOS and [Xcode 12+](https://developer.apple.com/xcode/) installed is required!
+
+First, run the following to install dependencies and build the web extension:
+
 ```
 yarn install && yarn build && yarn package
 ```
 
+Then run the `build:safari` command to build the Safari extension around the web extension:
+
+```
+yarn build:safari
+```
+
+![Confirm Safari](./docs/safari-confirm.png "Confirm Safari")
+
+Hit `enter` when presented with this screen.
+
+`Xcode` will open the `Gitpod.xcodeproj` automatically if it's installed.
+
 ## Test
 
 [Build](#build) the extension and
 * unzip `gitpod.xpi` and load it as [“unpackaged extension” (Chrome)](https://developer.chrome.com/extensions/getstarted) or
-* load `gitpod.xpi` as [“temporary add-on” (Firefox)](https://blog.mozilla.org/addons/2015/12/23/loading-temporary-add-ons/).
+* load `gitpod.xpi` as [“temporary add-on” (Firefox)](https://blog.mozilla.org/addons/2015/12/23/loading-temporary-add-ons/) or
+* open `Gitpod/Gitpod.xcodeproj` and run the project with `cmd` + `r`. ⚠️ _Safari must have [**Allow Unsigned Extensions**](https://developer.apple.com/documentation/safariservices/safari_app_extensions/building_a_safari_app_extension) enabled._
 
 The extension is active until the next restart of your browser.

docs/safari-confirm.png

@@ -7,6 +7,7 @@
   "main": "src/gitpodify.js",
   "scripts": {
     "build": "yarn clean && npx tsc && yarn webpack",
+    "build:safari": " xcrun safari-web-extension-converter . --app-name Gitpod --bundle-identifier io.gitpod.Gitpod",
     "package": "yarn clean:package && zip -rD --exclude='src/*.ts' gitpod.xpi dist/bundles icons src manifest.json",
     "clean": "rimraf dist && yarn clean:package",
     "clean:package": "rimraf gitpod.xpi",