DOC: Update release guidelines

RELEASE_GUIDELINES.md

@@ -6,7 +6,8 @@ guidelines of the CaosDB Project
 
 ## General Prerequisites
 
-* All tests are passing.
+* All tests are passing. (Note that pipelines may fail if the major
+  version increased. Rely on manual tests in that case.)
 * (FEATURES.md is up-to-date and a public API is being declared in that document.)
 * CHANGELOG.md is up-to-date.
 * (DEPENDENCIES.md is up-to-date.)
@@ -36,3 +37,6 @@ guidelines of the CaosDB Project
    section to the CHANGELOG.
 
 10. Create a release at the [gitlab repo](https://gitlab.com/linkahead/linkahead-mariadbbackend/-/releases)
+
+11. If necessary, i.e., if the patch or major versions were increased
+    with the release, do a LinkAhead server release.