first commit

Dockerfile

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+FROM node:20.12.2-slim
+
+RUN apt-get update && \
+    apt-get install -y locales git procps
+RUN locale-gen ja_JP.UTF-8
+RUN localedef -f UTF-8 -i ja_JP ja_JP
+ENV LANG=ja_JP.UTF-8
+ENV TZ=Asia/Tokyo
+WORKDIR /nodejs-study

app.js

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+'use strict';
+const number = process.argv[2] || 0;
+let sum = 0;
+for (let i = 1; i <= number; i++) {
+  sum = sum + i;
+}
+console.log(sum);

compose.yml

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+services:
+  app:
+    build: .
+    tty: true
+    volumes:
+      - .:/nodejs-study