feat: Add automatic docker build when tagged on master

.drone.yml

@@ -21,7 +21,21 @@ steps:
       from_secret: "gitea_base_url"
     files: build/libs/CSharpCommentChecker-*.jar
   when:
-    branch:
-    - master
+    event:
+      - tag
+- name: "Push docker image"  
+  image: plugins/docker
+  settings:
+    username:
+      from_secret: "docker_username"
+    password:
+      from_secret: "docker_password"
+    repo:
+      from_secret: "docker_repo"
+    tags: latest
+    auto_tag: true
+  when:
+    event:
+      - tag
 
 

Dockerfile

@@ -0,0 +1,6 @@
+FROM eclipse-temurin:16-jdk
+
+RUN mkdir /opt/validation
+
+COPY build/libs/CSharpCommentChecker-*.jar /opt/validation/
+RUN mv /opt/validation/CSharpCommentChecker-*.jar /opt/validation/CSharpCommentChecker.jar