ci: temporary fix for docker in docker builds

.gitlab-ci.yml

@@ -102,9 +102,11 @@ build:doc:
     - name: gitlab.fit.cvut.cz:5000/algorithms-library-toolkit/infrastructure/ci-docker-images/docker:dind
       alias: docker
   variables:
-    # DOCKER_TLS_CERTDIR: "/certs"
     DOCKER_DRIVER: overlay2
     DOCKER_HOST: docker
+    # TODO: Remove after enabling TLS; https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#docker-in-docker-with-tls-disabled-in-the-docker-executor.
+    DOCKER_HOST: tcp://docker:2375
+    DOCKER_TLS_CERTDIR: ""
   before_script:
     - apk add docker bash git