Blog: add description about --build-sea in 25.5.0 release notes (#8566)

* Blog: add description about --build-sea in 25.5.0 release notes

* Apply suggestions from code review

Co-authored-by: Copilot <[email protected]>
Signed-off-by: Joyee Cheung <[email protected]>

* Update apps/site/pages/en/blog/release/v25.5.0.md

Co-authored-by: Copilot <[email protected]>
Signed-off-by: Joyee Cheung <[email protected]>

* Update apps/site/pages/en/blog/release/v25.5.0.md

Co-authored-by: Copilot <[email protected]>
Signed-off-by: Joyee Cheung <[email protected]>

* Update apps/site/pages/en/blog/release/v25.5.0.md

Signed-off-by: Joyee Cheung <[email protected]>

---------

Signed-off-by: Joyee Cheung <[email protected]>
Co-authored-by: Copilot <[email protected]>

Author: joyeecheung

apps/site/pages/en/blog/release/v25.5.0.md

@@ -10,6 +10,28 @@ author: Antoine du Hamel
 
 ### Notable Changes
 
+#### Streamlined building process of Single Executable Applications (SEA)
+
+This release introduces a new `--build-sea` command-line flag that simplifies the process of building [Single Executable Applications (SEA)](https://nodejs.org/api/single-executable-application.html) using Node.js.
+
+Previously, SEA generation involved copying the executable, generating the preparation blob with `--experimental-sea-config`, and injecting the blob into the copy using [nodejs/postject](https://github.com/nodejs/postject). With the new `--build-sea` flag, these steps are now consolidated into a single step available from Node.js core.
+
+```console
+$ echo 'console.log("Hello")' > hello.js
+$ echo '{ "main": "hello.js", "output": "sea" }' > sea-config.json
+$ node --build-sea sea-config.json
+$ ./sea
+Hello
+```
+
+For the time being, backward compatibility with the postject-based SEA building process as well as the `--experimental-sea-config` will be maintained, until there's motivation to break it (e.g. for optimizations).
+
+See the [documentation](https://nodejs.org/download/release/v25.5.0/docs/api/single-executable-applications.html#generating-single-executable-applications-with---build-sea) for more details.
+
+Contributed by Joyee Cheung in [#61167](https://github.com/nodejs/node/pull/61167).
+
+#### Other Notable Changes
+
 - \[[`99a4e51f93`](https://github.com/nodejs/node/commit/99a4e51f93)] - **crypto**: update root certificates to NSS 3.119 (Node.js GitHub Bot) [#61419](https://github.com/nodejs/node/pull/61419)
 - \[[`fbe4da5725`](https://github.com/nodejs/node/commit/fbe4da5725)] - **(SEMVER-MINOR)** **deps**: add LIEF as a dependency (Joyee Cheung) [#61167](https://github.com/nodejs/node/pull/61167)
 - \[[`0feab0f083`](https://github.com/nodejs/node/commit/0feab0f083)] - **(SEMVER-MINOR)** **deps**: add tools and scripts to pull LIEF as a dependency (Joyee Cheung) [#61167](https://github.com/nodejs/node/pull/61167)