docker-build-push/docs/advanced/secrets.md

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# Secrets
In the following example we will expose and use the [GITHUB_TOKEN secret](https://docs.github.com/en/actions/reference/authentication-in-a-workflow#about-the-github_token-secret)
as provided by GitHub in your workflow.
First let's create our `Dockerfile` to use our secret:
```Dockerfile
#syntax=docker/dockerfile:1.2
FROM alpine
RUN --mount=type=secret,id=github_token \
cat /run/secrets/github_token
```
As you can see we have named our secret `github_token`. Here is the workflow you can use to expose this secret using
the [`secrets` input](../../README.md#inputs):
```yaml
name: ci
on:
push:
branches:
- 'master'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Set up QEMU
uses: docker/setup-qemu-action@v1
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
-
name: Build
uses: docker/build-push-action@v2
with:
context: .
platforms: linux/amd64,linux/arm64
tags: user/app:latest
secrets: |
"github_token=${{ secrets.GITHUB_TOKEN }}"
```
> :bulb: You can also expose a secret file to the build with [`secret-files`](../../README.md#inputs) input:
> ```yaml
> secret-files: |
> "MY_SECRET=./secret.txt"
> ```
If you're using [GitHub secrets](https://docs.github.com/en/actions/reference/encrypted-secrets) and need to handle
multi-line value, you will need to place the key-value pair between quotes:
```yaml
secrets: |
"MYSECRET=${{ secrets.GPG_KEY }}"
GIT_AUTH_TOKEN=abcdefghi,jklmno=0123456789
"MYSECRET=aaaaaaaa
bbbbbbb
ccccccccc"
FOO=bar
"EMPTYLINE=aaaa
bbbb
ccc"
"JSON_SECRET={""key1"":""value1"",""key2"":""value2""}"
```
| Key | Value |
|--------------------|--------------------------------------------------|
| `MYSECRET` | `***********************` |
| `GIT_AUTH_TOKEN` | `abcdefghi,jklmno=0123456789` |
| `MYSECRET` | `aaaaaaaa\nbbbbbbb\nccccccccc` |
| `FOO` | `bar` |
| `EMPTYLINE` | `aaaa\n\nbbbb\nccc` |
| `JSON_SECRET` | `{"key1":"value1","key2":"value2"}` |
> :bulb: All quote signs need to be doubled for escaping.