Revert "drm_hwcomposer: CI: Only run build-docker when necessary"

This reverts commit d82729393ce27104160e5e990e30d422f9ae3202.
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ea15c9a..da052c3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -27,13 +27,6 @@
     - docker push $DOCKER_IMAGE_TAG
   after_script:
     - docker logout
-  rules:
-    - if: $CI_PIPELINE_SOURCE == 'merge_request_event'
-      changes:
-      - .ci/Dockerfile
-    - if: $CI_PIPELINE_SOURCE == 'push'
-      changes:
-      - .ci/Dockerfile
 
 build:
   stage: build