Changes

jobs/registry-rebuild-upload-android: new job

Add a job to build and upload the debian-bookworm-android image, to be
used for building the android-apdu-proxy app and possibly more in the
future.

Related: OS#6367
Depends: docker-playground Ic7a454be23072c3f0ed609d370fc88f49205b04c
Change-Id: Ia71bf8df638b9c4359d8b1a723795029541e023a

jobs/master-builds: add android-apdu-proxy

Gradle downloads a lot of files during the build, mount the cache dirs
so this is only done once for master builds.

Related: OS#6367
Change-Id: Ie7c3948e8c4a1a75a1efaac3e7c238601c5cdccb

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