Add Dockerfile and CI Docker build stage

Update CI script

Added Docker DIND

Updated CI and Dockerfile

Another CI update

.gitlab-ci.yml

@@ -1,7 +1,7 @@
-image: "alpine"
 stages:
   - build
   - publish
+  - publish_docker
 
 cache:
   paths:
@@ -19,14 +19,29 @@ publish:
   only:
     - tags
   before_script:
-    - apk update
-    - apk add git zip
-  script:
+    - apk update && apk add git zip
     - export VERSION=`git describe --tags --dirty`
+  script:
     - cp build/libs/mangadex_at_home-${VERSION}-all.jar ./
     - zip -r9 mangadex_at_home-${VERSION}.zip mangadex_at_home-${VERSION}-all.jar settings.sample.json
   artifacts:
-    name: "mangadex_at_home-${CI_COMMIT_TAG}"
+    name: "mangadex_at_home"
     paths:
       - "*.jar"
       - settings.sample.json
+
+publish_docker:
+  image: docker:git
+  stage: publish
+  only:
+    - tags
+  services:
+    - docker:dind
+  before_script:
+    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin ${CI_REGISTRY}
+    - export VERSION=`git describe --tags --dirty`
+  script:
+    - mv build/libs/mangadex_at_home-${VERSION}-all.jar build/libs/mangadex_at_home.jar
+    - docker build -t ${CI_REGISTRY_IMAGE}:${VERSION} -t ${CI_REGISTRY_IMAGE}:latest .
+    - docker push ${CI_REGISTRY_IMAGE}:${VERSION}
+    - docker push ${CI_REGISTRY_IMAGE}:latest

Dockerfile

@@ -0,0 +1,6 @@
+FROM openjdk:15-alpine
+WORKDIR /mangahome
+COPY /build/libs/mangadex_at_home.jar .
+VOLUME "/mangahome/cache"
+EXPOSE 443 8080
+CMD java -Dfile-level=off -Dstdout-level=trace -jar mangadex_at_home.jar