Changes

jobs/master-builds: archive android-apdu-proxy apk

Store the apk after successful run of the android-apdu-proxy job. It can
be found by clicking on a job at [1] and then clicking on "default"
(since the job is behind a matrix, as all master jobs).

[1]: https://jenkins.osmocom.org/jenkins/job/master-android-apdu-proxy/

Related: OS#6367
Change-Id: If3224da6c4e3fa90fa84abfec4e75efd634a8bfa