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docs: priority attribute

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Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
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@ -33,6 +33,7 @@ ___
* [Notes](#notes)
* [Image name and tag sanitization](#image-name-and-tag-sanitization)
* [Latest tag](#latest-tag)
* [`priority` attribute](#priority-attribute)
* [Global expressions](#global-expressions)
* [`{{branch}}`](#branch)
* [`{{tag}}`](#tag)
@ -361,7 +362,7 @@ Each entry is defined by a `type`, which are:
And global attributes:
* `enable=<true|false>` enable this entry (default `true`)
* `priority=<number>` priority to manage the order of tags
* `priority=<number>` set tag [priority](#priority-attribute) order
* `prefix=<string>` add prefix
* `suffix=<string>` add suffix
@ -670,6 +671,24 @@ tags: |
type=raw,value=latest,enable={{is_default_branch}}
```
### `priority` attribute
`priority=<int>` attribute is used to sort tags in the final list. The higher
the value, the higher the priority. The first tag in the list (higher priority)
will be used as the image version for generated OCI label and [`version` output](#outputs).
Each tags `type` attribute has a default priority:
| Attribute | Default priority |
|------------|------------------|
| `schedule` | `1000` |
| `semver` | `900` |
| `pep440` | `900` |
| `match` | `800` |
| `edge` | `700` |
| `ref` | `600` |
| `raw` | `200` |
| `sha` | `100` |
### Global expressions
The following [Handlebars' template](https://handlebarsjs.com/guide/) expressions