Update temporary DroneCI configuration

.drone.yml

@@ -8,36 +8,16 @@ trigger:
 load: yes
 
 steps:
-  - name: build
-    image: maven:3-eclipse-temurin-16
-    commands:
-      - mvn package --no-transfer-progress -DskipTests=true -Dmaven.javadoc.skip=true -B -V
-
-
-  - name: test
-    image: maven:3-eclipse-temurin-16
-    commands:
-      - mvn test --no-transfer-progress -B
-
-  - 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
-    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
 
   - name: maven-auth
     image: robertstettner/drone-mvn-auth
     pull: true
     servers:
       - id: nexus
-        username: ${NEXUS_USERNAME}
+        username:
-        password: ${NEXUS_PASSWORD}
+          from_secret: nexus_username
+        password:
+          from_secret: nexus_password
     profiles:
       - id: default
         repositories: