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Update 02_our_app.md 

node:12-alpine -> node:18-alpine
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get-started/02_our_app.md
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@ -101,7 +101,7 @@ In order to build the [container image](../get-started/overview.md/#docker-objec
$ docker build -t getting-started .
```
The `docker build` command uses the Dockerfile to build a new container image. You might have noticed that Docker downloaded a lot of "layers". This is because you instructed the builder that you wanted to start from the `node:12-alpine` image. But, since you didn't have that on your machine, Docker needed to download the image.
The `docker build` command uses the Dockerfile to build a new container image. You might have noticed that Docker downloaded a lot of "layers". This is because you instructed the builder that you wanted to start from the `node:18-alpine` image. But, since you didn't have that on your machine, Docker needed to download the image.
After Docker downloaded the image, the instructions from the Dockerfile copied in your application and used `yarn` to install your application's dependencies. The `CMD` directive specifies the default command to run when starting a container from this image.