Use GitLab CI template.

.gitlab-ci.yml

 ---
-stages:
-  - test
-
-pre-commit:
-  stage: test
-  image: adarnimrod/ci-images:pre-commit
-  variables:
-    XDG_CACHE_HOME: "$CI_PROJECT_DIR/.cache"
-    # Disabled until https://github.com/pre-commit/pre-commit/issues/1387 is
-    # resolved.
-    SKIP: "hadolint,docker-compose"
-  script:
-    - pre-commit run --all-files
-  cache:
-    paths:
-      - .cache/
+include:
+  - project: shore/ci-templates
+    file: templates/pre-commit.yml