Make certificate files world readable

Summary:
This is useful for system apps. The files are owned by root, but they need to be readable by the app. There's nothing secret in these files, so it's not a problem.

This doesn't address all issues with system apps, e.g. https://github.com/facebook/flipper/issues/536 but does go some way towards it.

I was able to get a system app to connect successfully, but there may be different states that they can be in, so I don't think it's a fix all.

Reviewed By: passy

Differential Revision: D17499438

fbshipit-source-id: ab82583b5d607f75ff4578ab9ac2baf9d74241f8

src/utils/androidContainerUtilityInternal.tsx

@@ -57,7 +57,7 @@ export function _push(
   return executeCommandAsApp(
     deviceId,
     app,
-    `echo "${contents}" > '${filename}' && chmod 600 '${filename}'`,
+    `echo "${contents}" > '${filename}' && chmod 644 '${filename}'`,
   ).then(output => undefined);
 }