Finish implementing functional Maven build system

.drone.yml

@@ -1,15 +1,41 @@
 kind: pipeline
-name: default
+type: docker
+name: build
 
 trigger:
   branch:
     - main
-
-load: yes
+  event:
+    - push
+    - pull_request
 
 steps:
+  # test if it compiles correctly
+  - name: build
+    image: maven:3-eclipse-temurin-16
+    commands:
+      - mvn verify --no-transfer-progress -DskipTests=true -Dmaven.javadoc.skip=true -B -V
 
+  # run unit tests
+  - name: test
+    image: maven:3-eclipse-temurin-16
+    commands:
+      - mvn test --no-transfer-progress -B -V
 
+  # run code analysis
+  - name: code-analysis
+    image: maven:3-eclipse-temurin-16
+    commands:
+      - mvn sonar:sonar --no-transfer-progress -Dsonar.projectKey=$SONAR_PROJECT_KEY -Dsonar.host.url=$SONAR_INSTANCE_URL -Dsonar.login=$SONAR_LOGIN_KEY -B -V
+    environment:
+      SONAR_PROJECT_KEY:
+        from_secret: sonar_project_key
+      SONAR_INSTANCE_URL:
+        from_secret: sonar_instance_url
+      SONAR_LOGIN_KEY:
+        from_secret: sonar_login_key
+
+  # upload to maven repository
   - name: maven-deploy
     image: maven:3-eclipse-temurin-16
     commands:
@@ -19,8 +45,29 @@ steps:
         from_secret: maven_repo_username
       MAVEN_REPO_PASSWORD:
         from_secret: maven_repo_password
-    when:
-      event:
-        - promote
-      target:
-        - production
+
+---
+
+kind: pipeline
+type: docker
+name: default
+
+trigger:
+  event:
+    - promote
+  target:
+    - production
+
+steps:
+  # skip all previous steps because they were already ran in the "build" phase; we don't need to re-analyze the code.
+  
+  # upload to maven repository
+  - name: maven-deploy
+    image: maven:3-eclipse-temurin-16
+    commands:
+      - mvn deploy --no-transfer-progress -DskipTests=true -Dmaven.javadoc.skip=true -B -V -gs settings.xml -Dmaven.repo.username=$MAVEN_REPO_USERNAME -Dmaven.repo.password=$MAVEN_REPO_PASSWORD
+    environment:
+      MAVEN_REPO_USERNAME:
+        from_secret: maven_repo_username
+      MAVEN_REPO_PASSWORD:
+        from_secret: maven_repo_password

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>wtf.beatrice.hidekobot</groupId>
     <artifactId>HidekoBot</artifactId>
-    <version>0.5.17</version>
+    <version>0.5.18-SNAPSHOT</version>
 
     <properties>
         <maven.compiler.source>16</maven.compiler.source>