コンテナCIのビルドを最適化

Dockerfile

@@ -19,13 +19,16 @@ COPY app.py .
 FROM base AS test
 COPY docker-compose.yml docker-compose.local.yml ./
 COPY tests ./tests
-RUN python -m unittest discover -s tests -v
+RUN python -m unittest discover -s tests -v \
+    && touch /tmp/tests-passed
 
 # 実行用ステージ
 FROM base AS runtime
 
 # 非rootユーザーを作成
-RUN useradd --create-home --shell /bin/bash appuser \
+COPY --from=test /tmp/tests-passed /tmp/tests-passed
+RUN rm /tmp/tests-passed \
+    && useradd --create-home --shell /bin/bash appuser \
     && chown -R appuser:appuser /app
 USER appuser