Кирилл Салихов

Dockerfile

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+FROM node:16-bullseye-slim
+
+RUN mkdir -p /app
+WORKDIR /app
+
+COPY package* ./
+RUN npm ci
+
+COPY app.js ./
+
+ENV GREETING_NAME=should_be_overriden
+EXPOSE 8080
+
+CMD ["node", "app.js"]
+

app.js

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+const Koa = require('koa');
+
+const port = 8080;
+const greetingName = process.env.GREETING_NAME ?? '__not_set__';
+
+new Koa()
+    .use(async ctx => {
+        ctx.body = `Hello, ${greetingName}`;
+    })
+    .listen(port, () => {
+        console.log(`Ready to receive requests on ${port}`);
+    })