Fix .gitlab-ci.yml syntax

.gitlab-ci.yml

@@ -8,8 +8,7 @@ docker-base:
   stage: prepare
   before_script:
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
-  script:
-    - docker build Docker -t 
+  
   # Use the official docker image.
   image: docker:stable
   tags:
@@ -61,7 +60,7 @@ collect-performance:   # This job runs in the test stage.
   dependencies:
     - build-job
   extends:
-  - build_das6
+  - .build_das6
   script:
     - build/microbenchmarks --benchmark_out=results.json --benchmark_out_format=json
   artifacts:
@@ -76,7 +75,7 @@ collect-performance-generic:
   stage: benchmark
   image: "$CI_REGISTRY_IMAGE:latest"
   extends:
-  - build_docker
+  - .build_docker
   script:
     - build/microbenchmarks --benchmark_out=results-generic.json --benchmark_out_format=json
   artifacts: