Add Proguard artifact endpoint for Android builds #237

Job	Run time
cli-integration (ubuntu)	18s
updater-test-args / cancel-previous-run	5s
cli-integration (macos)	4m 23s
cli-integration (windows)	27s
updater-test-args / validate-inputs	8s
updater-create-pr / cancel-previous-run	4s
updater-create-pr / validate-inputs	7s
updater-create-pr / update	18s
updater-test-args / update	11s
updater-test-outputs	3s
	6m 4s

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