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Major version zero doc (#74)

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Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>
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@ -39,6 +39,7 @@ ___
* [Notes](#notes)
* [Latest tag](#latest-tag)
* [Global expressions](#global-expressions)
* [Major version zero](#major-version-zero)
* [Overwrite labels](#overwrite-labels)
* [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
* [Contributing](#contributing)
@ -574,6 +575,25 @@ tags: |
type=raw,value=mytag-{{branch}}-{{sha}}
```
### Major version zero
Major version zero (`0.y.z`) is for initial development and **may** change at any time. This means the public API
[**should not** be considered stable](https://semver.org/#spec-item-4).
In this case, Docker tag `0` **should not** be generated if you're using [`type=semver`](#typesemver) with `{{major}}`
pattern. You can manage this behavior like this:
```yaml
# refs/tags/v0.1.2
tags: |
# output 0.1.2
type=semver,pattern={{version}}
# output 0.1
type=semver,pattern={{major}}.{{minor}}
# disabled if major zero
type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
```
### Overwrite labels
If some of the [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md)