Add more info about releasing to CONTRIBUTING.md

CONTRIBUTING.md

@@ -35,7 +35,7 @@ fixes, documentation, examples... But first, read this page (including the small
         - [Automatic incremental build](#automatic-incremental-build)
             * [Special case `bom-descriptor-json`](#special-case--bom-descriptor-json-)
             * [Usage by CI](#usage-by-ci)
-* [Release](#release)
+* [Release your own version](#release)
 * [Documentation](#documentation)
     + [Building the documentation](#building-the-documentation)
     + [Referencing a new guide in the index](#referencing-a-new-guide-in-the-index)
@@ -503,26 +503,33 @@ CI is using a slightly different GIB config than locally:
 
 For more details see the `Get GIB arguments` step in `.github/workflows/ci-actions-incremental.yml`.
 
-## Release
+## Release your own version
 
-To release version `x.y`, first update the version:
+You might want to release your own patched version of Quarkus to an internal repository.
+
+To do so, you will first need to update the version in the source code:
 
 ```shell
-./update-version.sh "x.y"
+./update-version.sh "x.y.z-yourcompany"
 ```
 
-Commit the changes then run:
+We use a shell script as we also need to update the version in various descriptors and test files.
+The shell script calls `./mvnw versions:set` under the hood, among other things.
+
+Commit the changes, then run:
 
 ```shell
-./mvnw --settings .github/mvn-settings.xml \
-            -B \
-            -Prelease \
-            -DskipTests -DskipITs \
-            -Ddokka \
-            -Dgpg.skip \
-            clean deploy
+./mvnw --settings your-maven-settings.xml \
+    clean deploy \
+    -DskipTests -DskipITs \
+    -DperformRelease=true \
+    -Prelease \
+    -Ddokka \
+    -Dgpg.skip
 ```
 
+If your Maven settings are in your global Maven settings file located in the `.m2/` directory, you can drop the `--settings your-maven-settings.xml` part.
+
 ## Documentation
 
 The documentation is hosted in the [`docs` module](https://github.com/quarkusio/quarkus/tree/main/docs) of the main