publish-apk: fix a SIGPIPE this repo's own README warns about

The zip check used `unzip -l | grep -q`. Under pipefail, grep exits on its
first match and SIGPIPEs unzip, so the pipeline fails on a perfectly valid
file. It rejected a real 112MB APK as 'not an APK'.

That exact trap is in the README's table, written after it broke crash
detection in android-launch-check. Knowing about a trap is not the same as not
falling into it, which is the argument for these scripts existing at all.

Captures the listing first and tests it with `case`, and the new test builds a
300-entry zip so grep matches long before the listing ends -- which is when
SIGPIPE actually bites. A single-entry fixture would have passed either way.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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