Simplify build.sh control flow (#1279)

* Simplify this control flow a bit

* No need to mention watchman as it's actually handled by the Linux installing dependencies link

README.md

@@ -19,17 +19,17 @@ The code is built using React-Native and running code locally requires a Mac or
 - Before starting, you need to install React Native dependencies:
     - [MacOs](https://facebook.github.io/react-native/docs/getting-started.html#installing-dependencies-1)
     - [Linux](https://facebook.github.io/react-native/docs/getting-started.html#installing-dependencies-2)
- - Now clone this repo and then install all our dependencies
- - You'll also need to rename the `.*.env.example` files (remove the `.example`) in the root of the project and fill in the appropriate values for each key
+- Now clone this repo and then install all our dependencies.
 
 ```bash
 cd metamask-mobile
 yarn install
 ```
+- Rename the `.*.env.example` files (remove the `.example`) in the root of the project and fill in the appropriate values for each key.
 
 - Running the app on Android:
 
-You'll need the `secret-tool` (a part of [libsecret-tools](https://launchpad.net/ubuntu/bionic/+package/libsecret-tools) package on Debian/Ubuntu based distributions) and `watchman` binaries on your machine. You'll also want to have the android SDK; the easiest way to do that is by installing [Android Studio](https://developer.android.com/studio). Additionally, you'll need to install the Google Play Licencing Library via the SDK Manager in Android Studio.
+You will need the `secret-tool` (a part of [libsecret-tools](https://launchpad.net/ubuntu/bionic/+package/libsecret-tools) package on Debian/Ubuntu based distributions) binary on your machine. You'll also want to have the android SDK; the easiest way to do that is by installing [Android Studio](https://developer.android.com/studio). Additionally, you'll need to install the Google Play Licencing Library via the SDK Manager in Android Studio.
 
 ```bash
 yarn start:android

scripts/build.sh

@@ -235,28 +235,20 @@ checkParameters "$@"
 printTitle
 
 if [ "$PLATFORM" == "ios" ]; then
-	if [ -f "$IOS_ENV_FILE" ]; then
+	# we don't care about env file in CI
+	if [ -f "$IOS_ENV_FILE" ] || [ "$CI" = true ]; then
 		buildIos
 	else
-		# we don't care about env file in CI
-		if [ "$CI" = "true" ]; then
-			buildIos
-		else
-			envFileMissing $IOS_ENV_FILE
-		fi
+		envFileMissing $IOS_ENV_FILE
 	fi
 
 
 
 else
-	if [ -f "$ANDROID_ENV_FILE" ]; then
+	# we don't care about env file in CI
+	if [ -f "$ANDROID_ENV_FILE" ] || [ "$CI" = true ]; then
 		buildAndroid
 	else
-		# we don't care about env file in CI
-		if [ "$CI" = "true" ]; then
-			buildAndroid
-		else
-			envFileMissing $ANDROID_ENV_FILE
-		fi
+		envFileMissing $ANDROID_ENV_FILE
 	fi
 fi