[CHORE] Add Start Packager script (#1639)

ios/RocketChatRN.xcodeproj/project.pbxproj

@@ -278,6 +278,7 @@
 			buildConfigurationList = 13B07F931A680F5B00A75B9A /* Build configuration list for PBXNativeTarget "RocketChatRN" */;
 			buildPhases = (
 				FB4AC4FF76ACF097F2431C74 /* [CP] Check Pods Manifest.lock */,
+				7AA5C63E23E30D110005C4A7 /* Start Packager */,
 				13B07F871A680F5B00A75B9A /* Sources */,
 				13B07F8C1A680F5B00A75B9A /* Frameworks */,
 				13B07F8E1A680F5B00A75B9A /* Resources */,
@@ -520,6 +521,24 @@
 			shellPath = /bin/sh;
 			shellScript = "export NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh\n";
 		};
+		7AA5C63E23E30D110005C4A7 /* Start Packager */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+			);
+			name = "Start Packager";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "export RCT_METRO_PORT=\"${RCT_METRO_PORT:=8081}\"\necho \"export RCT_METRO_PORT=${RCT_METRO_PORT}\" > \"${SRCROOT}/../node_modules/react-native/scripts/.packager.env\"\nif [ -z \"${RCT_NO_LAUNCH_PACKAGER+xxx}\" ] ; then\n  if nc -w 5 -z localhost ${RCT_METRO_PORT} ; then\n    if ! curl -s \"http://localhost:${RCT_METRO_PORT}/status\" | grep -q \"packager-status:running\" ; then\n      echo \"Port ${RCT_METRO_PORT} already in use, packager is either not running or not running correctly\"\n      exit 2\n    fi\n  else\n    open \"$SRCROOT/../node_modules/react-native/scripts/launchPackager.command\" || echo \"Can't start packager automatically\"\n  fi\nfi\n";
+		};
 		9558AC195A3506BB8472CE99 /* [CP] Embed Pods Frameworks */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;