Move the keystore guard from after the Decode step (step 9) to right
after Resolve build label (step 3). A release tag pushed without
ANDROID_KEYSTORE_BASE64 configured now fails in seconds instead of
after JDK + Python + Android SDK + NDK install (~3-5 min of wasted
runner time). Switched the condition from steps.keystore.outputs.present
to env.ANDROID_KEYSTORE_BASE64 since the env var is set at job level
and the keystore decode step has not yet run at the new position.
alexei.dolgolyov
a026f0b349