fix(build): tini の差し戻し

[MikuroXina]

Type of Change:

Dockerfile の修正

Details of implementation (実施内容)

Docker コンテナのビルド時に tini のコピーに失敗しているようなので, 一旦 tini を使わないように差し戻します.

[codecov-commenter]

Codecov Report

Merging #638 (1341817) into main (47f1bc1) will not change coverage.
The diff coverage is n/a.

❗ Current head 1341817 differs from pull request most recent head 3b7b32a. Consider uploading reports for the commit 3b7b32a to get more accurate results

@@           Coverage Diff           @@
##             main     #638   +/-   ##
=======================================
  Coverage   73.89%   73.89%           
=======================================
  Files          64       64           
  Lines        4551     4551           
  Branches      410      410           
=======================================
  Hits         3363     3363           
  Misses        781      781           
  Partials      407      407           

Flag	Coverage Δ
unittests	73.89% <ø> (ø)

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