Oh that's more specific to that one repository.

The first line is just to list all the available emulators. This is convenient when Android decide to deprecate an older device which breaks the CI. When that happens, it's easy to see from the CI log which device is deprecated and which alternatives are available.

The second line is to fetch the Android app signing credential from a private repository. This is not needed for this CI task, but it was just copied over from the CI task that deploys the app to the app store.