feat(doc): fluidattacks#1328 update github actions example

- Update the GitHub Actions example in the Getting
Started guide to show the use of
`chown -R root:root /github/workspace`

Signed-off-by: Robin Quintero <rohaquinlop301@gmail.com>

docs/src/getting-started.md

@@ -88,9 +88,17 @@ Example:
           - uses: docker://ghcr.io/fluidattacks/makes/amd64:24.02
             name: helloWorld
             with:
-              args: m . /helloWorld 1 2 3
+              args: sh -c "chown -R root:root /github/workspace && nix-env -if . && m . /helloWorld 1 2 3"
     ```
 
+    ???+ note
+
+        We use `chown -R root:root /github/workspace` to solve the error:
+        `fatal: detected dubious ownership in repository at ...`, this message
+        typically indicates an issue with the ownership or permissions of the repository.
+        Checkout the [community discussion](https://github.com/orgs/community/discussions/48355)
+        for more information.
+
 === "GitLab CI"
 
     ```yaml