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Note about image name and tag sanitization

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Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
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@ -31,6 +31,7 @@ ___
* [`type=raw`](#typeraw)
* [`type=sha`](#typesha)
* [Notes](#notes)
* [Image name and tag sanitization](#image-name-and-tag-sanitization)
* [Latest tag](#latest-tag)
* [Global expressions](#global-expressions)
* [`{{branch}}`](#branch)
@ -625,6 +626,22 @@ tags: |
## Notes
### Image name and tag sanitization
In order to comply with [the specification](https://docs.docker.com/engine/reference/commandline/tag/#extended-description),
the image name components may contain lowercase letters, digits and separators.
A separator is defined as a period, one or two underscores, or one or more
dashes. A name component may not start or end with a separator.
A tag name must be a valid ASCII chars sequences and may contain lowercase and
uppercase letters, digits, underscores, periods and dashes. A tag name may not
start with a period or a dash and may contain a maximum of 128 characters.
To ease the integration in your workflow, this action will automatically:
* Lowercase the image name
* Replace invalid chars sequences with `-` for tags
### Latest tag
`latest` tag is handled through the [`flavor` input](#flavor-input). It will be generated by default (`auto` mode) for: