test ci

.gitlab-ci.yml

@@ -3,6 +3,7 @@ image: docker:20.10.22
 stages:
   - test
   - build
+  - push
 
 ##############
 # TEST STAGE #
@@ -37,10 +38,42 @@ build:
   services:
     - docker:dind
   before_script:
-    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+    - echo -n $CI_REGISTRY_PASSWORD | docker login -u $CI_REGISTRY_USER --password-stdin $CI_REGISTRY
   script:
-    - docker build --pull -t "$CI_REGISTRY_IMAGE" .
-    - docker push "$CI_REGISTRY_IMAGE"
+    # fetches the latest image (not failing if image is not found)
+    - docker pull $CI_REGISTRY_IMAGE:latest || true
+    - >
+      docker build 
+      --pull
+      --cache-from $CI_REGISTRY_IMAGE:latest
+      --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA 
+      .
+    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+
+##############
+# PUSH STAGE #
+##############
+
+push latest:
+  stage: push
+  variables:
+    GIT_STRATEGY: none
+  before_script:
+    - echo -n $CI_REGISTRY_PASSWORD | docker login -u $CI_REGISTRY_USER --password-stdin $CI_REGISTRY
   only:
     - main
-  when: manual
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+    - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:latest
+    - docker push $CI_REGISTRY_IMAGE:latest
+
+push tag:
+  stage: push
+  variables:
+    GIT_STRATEGY: none
+  only:
+    - tags
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+    - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME