Only build/tag/push images once

Signed-off-by: Rémy Coutable <remy@rymai.me>

.gitlab-ci.yml

@@ -6,13 +6,16 @@ stages:
   - automation
 
 services:
-- docker:dind
+  - docker:19.03.0-dind
 
 variables:
-  DOCKER_DRIVER: overlay
+  DOCKER_DRIVER: overlay2
+  DOCKER_HOST: tcp://docker:2375
+  FORCE_BUILD: "false"
 
 before_script:
   - docker login -u "gitlab-ci-token" -p "$CI_JOB_TOKEN" "$CI_REGISTRY"
+  - source scripts/build-helpers.sh
 
 .test_build: &test_build
   stage: test
@@ -23,6 +26,8 @@ before_script:
     - docker build -f "Dockerfile.$1" .
   except:
     - master
+  tags:
+    - docker
 
 .build_and_deploy: &build_and_deploy
   stage: build
@@ -31,6 +36,8 @@ before_script:
     - docker push "$CI_REGISTRY_IMAGE:$CI_JOB_NAME"
   only:
     - master
+  tags:
+    - docker
 
 .test_custom: &test_custom
   stage: test
@@ -41,14 +48,18 @@ before_script:
     - ./scripts/custom-docker-build $1
   except:
     - master
+  tags:
+    - docker
 
 .build_and_deploy_custom: &build_and_deploy_custom
   stage: build
   script:
     - ./scripts/custom-docker-build $CI_JOB_NAME -t "$CI_REGISTRY_IMAGE:$CI_JOB_NAME"
-    - docker push "$CI_REGISTRY_IMAGE:$CI_JOB_NAME"
+    - push_if_needed "$CI_REGISTRY_IMAGE:$CI_JOB_NAME"
   only:
     - master
+  tags:
+    - docker
 
 # Tests