Wip/gitlab ci (#32)

Start CI/CD on a gitlab instance.

.gitlab-ci.yml

@@ -1,25 +1,69 @@
-default:
-  # Template project: https://gitlab.com/pages/jekyll
-  # Docs: https://docs.gitlab.com/ee/pages/
-  image: ruby:3.2
+stages:
+  - build
+  - test
+  - publish
+  - deploy
+
+.any-job:
+  rules:
+    - if: $CI_SERVER_HOST == "gitlab.mnl.de"
+
+.gradle-job:
+  extends: .any-job
+  image: registry.mnl.de/org/jgrapes/jdk21-builder:v2
+  cache:
+    - key: dependencies
+      policy: pull-push  
+      paths:
+        - .gradle
+        - node_modules
+    - key: "$CI_COMMIT_SHA"
+      policy: pull-push
+      paths:
+        - build
+        - "*/build"
+  before_script:
+    - echo -n $CI_REGISTRY_PASSWORD | podman login -u "$CI_REGISTRY_USER" --password-stdin $CI_REGISTRY
+    - git switch $CI_COMMIT_REF_NAME
+    - git pull
+    - git reset --hard $CI_COMMIT_SHA
+  
+build-jars:
+  stage: build
+  extends: .gradle-job  
+  script:
+    - ./gradlew -Pdocker.registry=$CI_REGISTRY_IMAGE build apidocs
+
+publish-images:
+  stage: publish
+  extends: .gradle-job  
+  script:
+    - ./gradlew -Pdocker.registry=$CI_REGISTRY_IMAGE pushImage
+
+.pages-job:
+  extends: .any-job
+  image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/ruby:3.2
+  variables:
+    JEKYLL_ENV: production
+    LC_ALL: C.UTF-8
   before_script:
     - git fetch origin gh-pages
     - git checkout gh-pages
     - gem install bundler
     - bundle install
-variables:
-  JEKYLL_ENV: production
-  LC_ALL: C.UTF-8
-test:
+
+test-pages:
   stage: test
+  extends: .pages-job
   script:
     - bundle exec jekyll build -d test
   artifacts:
     paths:
       - test
       
-pages:
-  stage: deploy
+publish-pages:
+  stage: publish
+  extends: .pages-job
   script:
     - bundle exec jekyll build -d public
   artifacts: