ci: run the license checks via pre-commit

.gitlab-ci.yml

@@ -50,14 +50,11 @@ workflow:
       policy: ${CACHE_POLICY}
 
 Check licenses:
-  before_script:
-    - python -m pip install --upgrade pip
-    - python -m pip install reuse
-    - reuse --version
+  extends: .common_pre_commit
+  variables:
+    CACHE_POLICY: pull
   script:
-    - reuse lint
-  tags:
-    - sphinx
+    - pre-commit run --hook-stage manual reuse
   rules:
     - if: $CI_PIPELINE_SOURCE == "web"
       when: manual