align docker and CI with castellum

.gitlab-ci.yml

-image: docker
-services:
-  - docker:dind
-
 stages:
   - test
   - build
-  - release
 
 variables:
   DEBIAN_FRONTEND: noninteractive
-  PYTHON_IMAGE: buildpack-deps
   PYTHON_IMAGE_DEPENDENCIES: "python3-pip python3-psycopg2"
-  CONTAINER_TEST_IMAGE: registry.git.mpib-berlin.mpg.de/castellum/castellum_scheduler:$CI_COMMIT_REF_NAME
-  CONTAINER_RELEASE_IMAGE: registry.git.mpib-berlin.mpg.de/castellum/castellum_scheduler:latest
+  CONTAINER_IMAGE: registry.git.mpib-berlin.mpg.de/castellum/castellum_scheduler
 
-test-branch:
+test:
   stage: test
-  image: $PYTHON_IMAGE
-  script:
+  image: buildpack-deps
+  before_script:
     - apt-get update -q && apt-get install -y -qq $PYTHON_IMAGE_DEPENDENCIES
     - pip3 install -e .[test]
+  script:
     - flake8
     - django-admin makemigrations --dry-run --check --noinput --settings=scheduler.settings.development
     - django-admin test --settings=scheduler.settings.development
 
 build:
   stage: build
-  script:
+  image: docker
+  services:
+    - docker:dind
+  before_script:
     - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN registry.git.mpib-berlin.mpg.de
-    - docker build -t $CONTAINER_TEST_IMAGE .
-    - docker push $CONTAINER_TEST_IMAGE
-    - docker image ls
-
-release-image:
-  stage: release
+    - docker pull $CONTAINER_IMAGE:latest
   script:
-    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN registry.git.mpib-berlin.mpg.de
-    - docker pull $CONTAINER_TEST_IMAGE
-    - docker tag $CONTAINER_TEST_IMAGE $CONTAINER_RELEASE_IMAGE
-    - docker push $CONTAINER_RELEASE_IMAGE
-  only:
-    - master
+    - docker build --cache-from $CONTAINER_IMAGE:latest -t $CONTAINER_IMAGE:$CI_COMMIT_REF_NAME .
+  after_script:
+    - >
+      if [ "$CI_COMMIT_REF_NAME" == "main" ]; then
+        docker tag $CONTAINER_IMAGE:$CI_COMMIT_REF_NAME $CONTAINER_IMAGE:latest
+        docker push $CONTAINER_IMAGE:latest
+      fi
+    - >
+      if [ -n "$CI_COMMIT_TAG" ]; then
+        docker tag $CONTAINER_IMAGE:$CI_COMMIT_REF_NAME $CONTAINER_IMAGE:stable
+        docker push $CONTAINER_IMAGE:$CI_COMMIT_REF_NAME
+        docker push $CONTAINER_IMAGE:stable
+      fi

Dockerfile

-FROM node:14.15.4
+FROM node:14.17.3
 COPY package.json .
 RUN npm install --production
 
-FROM alpine:3.13.1
+FROM alpine:3.13.5
 
 ENV PYTHONUNBUFFERED 1
 ENV PKGS gettext python3 py3-pip py3-wheel uwsgi uwsgi-python py3-psycopg2 py3-pyldap
@@ -11,14 +11,15 @@ RUN adduser -D -g '' uwsgi
 
 RUN apk update && apk add $PKGS
 
-COPY scheduler/ code/scheduler/
-COPY setup.cfg setup.py uwsgi.ini LICENSE code/
-COPY --from=0 node_modules/ code/node_modules/
 WORKDIR code/
+COPY setup.cfg setup.py uwsgi.ini LICENSE ./
+COPY --from=0 node_modules/ node_modules
 
 RUN pip3 install -e . && \
     pip3 install django-auth-ldap
 
+COPY scheduler/ scheduler
+
 RUN django-admin collectstatic --no-input --settings=scheduler.settings.development && \
     django-admin compilemessages -l de