Enhance: GitHub ActionsでのFFmpegインストールの失敗時リトライするように

[kanarikanaru]

What

• backendのunitテストや連合テストで行われるffmepgインストールをリトライロジックを追加したものに書き換えた

Why

• テスト実行時、頻度は低いもののffmepgインストールに失敗→テスト自体が失敗として扱われる
• テストを通すために再度手動で実行するのが面倒

Additional info (optional)

• 動作すること、この状態でunitテストを通過できることを確認済み

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.89%. Comparing base (3c81926) to head (17429af).
Report is 37 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #15079       +/-   ##
============================================
+ Coverage    39.96%   62.89%   +22.93%     
============================================
  Files         1563      835      -728     
  Lines       197878    94006   -103872     
  Branches      3646     2669      -977     
============================================
- Hits         79080    59128    -19952     
+ Misses      118193    34827    -83366     
+ Partials       605       51      -554     

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[syuilo]

🙏🏻