Custom docker containers containing required bash scripts

Jobs should use custom images that contain all necessary scripts, instead of relying on the fact that the scripts exist in the target repository.

Related to hive#406 (closed)

.gitlab-ci.yml

@@ -100,10 +100,6 @@ lint_python_scripts:
       echo -e "\e[0Ksection_start:$(date +%s):push2[collapsed=true]\r\e[0KPushing image "$CI_REGISTRY_IMAGE/$BUILD_TARGET:$CI_COMMIT_SHA"..."
       docker push "$CI_REGISTRY_IMAGE/$BUILD_TARGET:$CI_COMMIT_SHA"
       echo -e "\e[0Ksection_end:$(date +%s):push2\r\e[0K" 
-  rules:
-    - if: $CI_COMMIT_BRANCH
-      exists:
-        - "Dockerfile.$BUILD_TARGET"
   tags:
     - public-runner-docker
 
@@ -118,21 +114,33 @@ build_docker_dind_image:
   script:
     - !reference [.build_docker_image, script]
   rules:
-    - !reference [.build_docker_image, rules]
+    - if: $CI_COMMIT_BRANCH
+      exists:
+        - Dockerfile.docker-dind
   services:
     - docker:20.10.10-dind
+  tags:
+    - public-runner-docker
 
 build_docker_builder_image:
   extends: .build_docker_image
   stage: build
   variables:
     BUILD_TARGET: "docker-builder"
+  rules:
+    - if: $CI_COMMIT_BRANCH
+      exists:
+        - Dockerfile.docker-builder
 
 build_image_remover_image:
   extends: .build_docker_image
   stage: build
   variables:
     BUILD_TARGET: "image-remover"
+  rules:
+    - if: $CI_COMMIT_BRANCH
+      exists:
+        - Dockerfile.image-remover
 
 prepare_example_hived_data_5m_image:
   extends: .prepare_hived_data_5m_image