Add the CI/CD configuration for Gradle and Maven build.

.drone.yaml

@@ -0,0 +1,24 @@
+---
+kind: pipeline
+type: docker
+name: gradle
+
+steps:
+  - name: test
+    image: gradle:8.3.0-jdk17-graal
+    commands:
+      - gradle assemble
+      - gradle check
+
+---
+kind: pipeline
+type: docker
+name: maven
+
+steps:
+  - name: test
+    image: maven:3.9.4-eclipse-temurin-17-alpine
+    commands:
+      - mvn install -DskipTests=true -Dmaven.javadoc.skip=true -B -V
+      - mvn test -B
+