build: dockerfile 1.14.1 and 1.15.0 release notes (#22443)

## Description

* https://github.com/moby/buildkit/releases/tag/dockerfile%2F1.14.1
* https://github.com/moby/buildkit/releases/tag/dockerfile%2F1.15.0

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

---------

Signed-off-by: CrazyMax <[email protected]>
Co-authored-by: Allie Sadler <[email protected]>

Author: crazy-max

content/manuals/build/buildkit/dockerfile-release-notes.md

@@ -13,6 +13,37 @@ issues, and bug fixes in [Dockerfile reference](/reference/dockerfile.md).
 
 For usage, see the [Dockerfile frontend syntax](frontend.md) page.
 
+## 1.15.0
+
+{{< release-date date="2025-04-15" >}}
+
+The full release note for this release is available
+[on GitHub](https://github.com/moby/buildkit/releases/tag/dockerfile%2F1.15.0).
+
+```dockerfile
+# syntax=docker/dockerfile:1.15.0
+```
+
+- Build error for invalid target now shows suggestions for correct possible names. [moby/buildkit#5851](https://github.com/moby/buildkit/pull/5851)
+- Fix SBOM attestation producing error for Windows targets. [moby/buildkit#5837](https://github.com/moby/buildkit/pull/5837)
+- Fix recursive `ARG` producing an infinite loop when processing an outline request. [moby/buildkit#5823](https://github.com/moby/buildkit/pull/5823)
+- Fix parsing syntax directive from JSON that would fail if the JSON had other datatypes than strings. [moby/buildkit#5815](https://github.com/moby/buildkit/pull/5815)
+- Fix platform in image config being in unnormalized form (regression from 1.12). [moby/buildkit#5776](https://github.com/moby/buildkit/pull/5776)
+- Fix copying into destination directory when directory is not present with WCOW. [moby/buildkit#5249](https://github.com/moby/buildkit/pull/5249)
+
+## 1.14.1
+
+{{< release-date date="2025-03-05" >}}
+
+The full release note for this release is available
+[on GitHub](https://github.com/moby/buildkit/releases/tag/dockerfile%2F1.14.1).
+
+```dockerfile
+# syntax=docker/dockerfile:1.14.1
+```
+
+- Normalize platform in image config. [moby/buildkit#5776](https://github.com/moby/buildkit/pull/5776)
+
 ## 1.14.0
 
 {{< release-date date="2025-02-19" >}}