ci: remove aggregated directory from previous runs

The .oniro-repo-workspace job uses GIT_STRATEGY=none, so CI_PROJECT_DIR
is not cleaned up between jobs. As a consequence, the "aggregated"
repository checkout may be present on job startup, thus upsetting
remaining logic.

Remvoe the aggregated repository before starting the build.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

.gitlab-ci.yml

@@ -145,7 +145,10 @@ deploy:
     name: registry.ostc-eu.org/ostc/oniro/docs-builder:latest
   stage: deploy
   script:
-    # We are in the root of the git-repo workspace.
+    # We are in the root of the git-repo workspace. Because
+    # .oniro-repo-workspace uses GIT_STRATEGY=none, the workspace is not
+    # cleaned automatically.
+    - rm -rf aggregated
     - git clone https://user:$CI_ONIRO_AGGREGATED_DOCS_TOKEN@gitlab.eclipse.org/eclipse/oniro-core/oniro-readthedocs-aggregated.git aggregated
     - find aggregated -maxdepth 1 -not -path aggregated/.git -not -path aggregated -exec rm -rvf {} \;
     - tar -c --dereference -C docs --exclude ./.git --exclude ./.gitlab-ci.yml . | tar -x -C aggregated