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docs: Add advice for pre-release tag support with v prefix

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This caveat was not easily apparent and has tripped up users. This addition should help raise awareness in advance of triggering the mistake.

Signed-off-by: Brennan Kinney <5098581+polarathene@users.noreply.github.com>
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Brennan Kinney 2026-01-27 10:44:07 +13:00 • committed by GitHub
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@ -532,6 +532,10 @@ with the following expressions:
> if specified) as tag because they are updated frequently, and contain many > if specified) as tag because they are updated frequently, and contain many
> breaking changes that are (by the author's design) not yet fit for public > breaking changes that are (by the author's design) not yet fit for public
> consumption. > consumption.
>
> If you expect to process pre-release versions that prepend or retain a `v` prefix
> for the image tag, do not add the prefix in `pattern` (as shown in the table above),
> instead add `,prefix=v` which will [avoid inconsistent tag generation][caveat::pre-release-tag].
Extended attributes and default values: Extended attributes and default values:
@ -585,6 +589,10 @@ with the following expressions:
> specified) as tag because they are updated frequently, and contain many > specified) as tag because they are updated frequently, and contain many
> breaking changes that are (by the author's design) not yet fit for public > breaking changes that are (by the author's design) not yet fit for public
> consumption. > consumption.
>
> If you expect to process pre-release versions that prepend or retain a `v` prefix
> for the image tag, do not add the prefix in `pattern` (as shown in the table above),
> instead add `,prefix=v` which will [avoid inconsistent tag generation][caveat::pre-release-tag].
Extended attributes and default values: Extended attributes and default values:
@ -1051,3 +1059,5 @@ More information about annotations in the [BuildKit documentation](https://githu
Want to contribute? Awesome! You can find information about contributing to Want to contribute? Awesome! You can find information about contributing to
this project in the [CONTRIBUTING.md](/.github/CONTRIBUTING.md) this project in the [CONTRIBUTING.md](/.github/CONTRIBUTING.md)
[caveat::pre-release-tag]: https://github.com/docker/metadata-action/issues/422#issuecomment-3797351389