docs: example to sanitize tags with metadata-action

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@ -100,7 +100,25 @@ or a cache reference:
```
To fix this issue you can use our [metadata action](https://github.com/docker/metadata-action)
to generate sanitized tags, or a dedicated step to sanitize the slug:
to generate sanitized tags:
```yaml
- name: Docker meta
id: meta
uses: docker/metadata-action@v3
with:
images: ghcr.io/${{ github.repository }}
tags: latest
- name: Build and push
uses: docker/build-push-action@v2
with:
context: .
push: true
tags: ${{ steps.meta.outputs.tags }}
```
Or a dedicated step to sanitize the slug:
```yaml
- name: Sanitize repo slug
@ -108,7 +126,7 @@ to generate sanitized tags, or a dedicated step to sanitize the slug:
id: repo_slug
with:
result-encoding: string
script: return '${{ github.repository }}'.toLowerCase()
script: return 'ghcr.io/${{ github.repository }}'.toLowerCase()
- name: Build and push
uses: docker/build-push-action@v2