ci: docsのビルドをキャッシュ

[MikuroXina]

close #1108.

Type of Change:

CI の変更

Details of implementation (実施内容)

docs 配下のファイルのハッシュをキャッシュのキーとして, Next.js のビルド成果物をキャッシュするようにしました.

[codecov[bot]]

Codecov Report

Merging #1128 (c0a1f80) into main (e21c93a) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1128   +/-   ##
=======================================
  Coverage   72.57%   72.57%           
=======================================
  Files          80       80           
  Lines        5484     5484           
  Branches      487      487           
=======================================
  Hits         3980     3980           
  Misses       1018     1018           
  Partials      486      486           

Flag	Coverage Δ
unittests	72.57% <ø> (ø)

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