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Merge pull request #685 from crazy-max/git-context-docs

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docs: fix Git context link and add more details about subdir support
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@ -49,9 +49,9 @@ to add emulation support with QEMU to be able to build against more platforms.
### Git context ### Git context
By default, this action uses the [Git context](#git-context) so you don't need By default, this action uses the [Git context](https://docs.docker.com/engine/reference/commandline/build/#git-repositories),
to use the [`actions/checkout`](https://github.com/actions/checkout/) action to so you don't need to use the [`actions/checkout`](https://github.com/actions/checkout/)
check out the repository because this will be done directly by [BuildKit](https://github.com/moby/buildkit). action to check out the repository as this will be done directly by [BuildKit](https://github.com/moby/buildkit).
The git reference will be based on the [event that triggered your workflow](https://docs.github.com/en/actions/reference/events-that-trigger-workflows) The git reference will be based on the [event that triggered your workflow](https://docs.github.com/en/actions/reference/events-that-trigger-workflows)
and will result in the following context: `https://github.com/<owner>/<repo>.git#<ref>`. and will result in the following context: `https://github.com/<owner>/<repo>.git#<ref>`.
@ -100,6 +100,11 @@ expression `{{defaultContext}}`. Here we can use it to provide a subdirectory
to the default Git context: to the default Git context:
```yaml ```yaml
-
# Setting up Docker Buildx with docker-container driver is required
# at the moment to be able to use a subdirectory with Git context
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
- -
name: Build and push name: Build and push
uses: docker/build-push-action@v3 uses: docker/build-push-action@v3
@ -108,9 +113,16 @@ to the default Git context:
push: true push: true
tags: user/app:latest tags: user/app:latest
``` ```
> :warning: Subdirectory for Git context is only available from [Buildkit version 0.9.0](https://github.com/moby/buildkit/releases/tag/v0.9.0).
Building from the current repository automatically uses the [GitHub Token](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token) > **Warning**
>
> Subdirectory for Git context is available from [BuildKit v0.9.0](https://github.com/moby/buildkit/releases/tag/v0.9.0).
> If you're using the `docker` builder (default if `setup-buildx-action` not used),
> then BuildKit in Docker Engine will be used. As Docker Engine < v22.x.x embeds
> Buildkit 0.8.2 at the moment, it does not support this feature. It's therefore
> required to use the `setup-buildx-action` at the moment.
Building from the current repository automatically uses the [GitHub Token](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token),
so it does not need to be passed. If you want to authenticate against another so it does not need to be passed. If you want to authenticate against another
private repository, you have to use a [secret](docs/advanced/secrets.md) named private repository, you have to use a [secret](docs/advanced/secrets.md) named
`GIT_AUTH_TOKEN` to be able to authenticate against it with buildx: `GIT_AUTH_TOKEN` to be able to authenticate against it with buildx: