Remove artifact uploads on push, generate APK only on release

[Copilot]

Artifacts were being generated on every push, wasting storage. APK should only be packaged when creating releases via tag push.

Changes

• Removed artifact upload step that ran on every build
• Restricted version extraction to tag pushes only (was running on all builds)
• Updated documentation to reflect artifacts are no longer generated on push

Workflow Behavior

Before:

# Ran on every push
- name: Upload signed APK artifact
  if: steps.signing.outputs.signing_ready == 'true'
  uses: actions/upload-artifact@v4

After:

• Regular pushes: build validation only, no artifacts
• Tag pushes: create release with APK directly attached

Usage

# Daily development - no APK generated
git push origin main

# Release - APK attached to GitHub release
git tag v4.5 && git push origin main v4.5

APK files in releases are directly downloadable (not zipped like artifacts).

Original prompt

修改github action，不需要每次提交都生成artifacts，我只需要在创建release的时候能打包apk就行。而且现在还是会上传zip文件而不是apk文件，我希望直接创建apk文件以便于下载

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