Because the previous step copying the file could be detected by the **Docker cache**, this step will also **use the Docker cache** when available.

    Using the cache in this step will **save** you a lot of **time** when building the image again and again during development, instead of **downloading and installing** all the dependencies **every time**.

5. Copy the `./app` directory inside the `/code` directory.

Dieses Image verfügt über einen **Auto-Tuning**-Mechanismus, um die **Anzahl der Arbeitsprozesse** basierend auf den verfügbaren CPU-Kernen festzulegen.