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Add small snippet for build secrets #1994

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4 changes: 4 additions & 0 deletions apps/build-secrets.html.md
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You can set [secrets](/docs/apps/secrets/) for your applications, but these are only available at _run-time_. They aren't available when building your Docker image without a little extra work.

Use the `build_` prefix when setting a secret with `fly secrets set` to make it available only at build time.
```bash
fly secrets set build_MY_SUPER_SECRET=some_value
```
To make a secret available at build time, we'll use [Docker secrets](https://docs.docker.com/develop/develop-images/build_enhancements/).

It's a 2-step process:
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some_command
```

Assuming your builder Dockerfile is named `Dockerfile.builder`, you can launch the emphemeral machine using the following command:

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[vale] reported by reviewdog 🐶
[Fly.Spelling] Is 'emphemeral' a typo?

Raw Output:
{"message": "[Fly.Spelling] Is 'emphemeral' a typo?", "location": {"path": "apps/build-secrets.html.md", "range": {"start": {"line": 103, "column": 84}}}, "severity": "INFO"}

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[vale] reported by reviewdog 🐶
[Fly.Machine] Use 'Machine' instead of ' machine'.

Raw Output:
{"message": "[Fly.Machine] Use 'Machine' instead of ' machine'.", "location": {"path": "apps/build-secrets.html.md", "range": {"start": {"line": 103, "column": 94}}}, "severity": "INFO"}

```cmd
flyctl console --dockerfile Dockerfile.builder -C "/srv/deploy.sh" --env=FLY_API_TOKEN=$(fly auth token)
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