Add the CI/CD configuration.

.drone.yaml

@@ -0,0 +1,74 @@
+---
+kind: pipeline
+type: docker
+name: gradle
+
+steps:
+  - name: test
+    image: gradle:8.3.0-jdk17-graal
+    commands:
+      - gradle assemble
+      - gradle check
+
+services:
+  - name: postgres
+    image: postgres:15-alpine
+    environment:
+      POSTGRES_DB: testdb
+      POSTGRES_USER: user
+      POSTGRES_PASSWORD: testpassword
+
+---
+kind: pipeline
+type: docker
+name: maven
+
+steps:
+  - name: test
+    image: maven:3.9.4-eclipse-temurin-17-alpine
+    volumes:
+      - name: package_cache
+        path: /root/.m2/
+    commands:
+      - mvn install -DskipTests=true -Dmaven.javadoc.skip=true -B -V
+      - mvn test -B
+
+  - name: build
+    image: maven:3.9.4-eclipse-temurin-17-alpine
+    volumes:
+      - name: package_cache
+        path: /root/.m2/
+    commands:
+      - mvn package -Dmaven.test.skip=true
+
+  - name: gitea_release
+    image: plugins/gitea-release
+    settings:
+      api_key:
+        from_secret: API_KEY
+      base_url:
+        from_secret: BASE_URL
+      files:
+        - target/*.jar
+      checksum:
+        - md5
+        - sha1
+        - sha256
+        - sha512
+        - adler32
+        - crc32
+    when:
+      event: tag
+
+volumes:
+  - name: package_cache
+    temp: {}
+
+services:
+  - name: postgres
+    image: postgres:15-alpine
+    environment:
+      POSTGRES_DB: testdb
+      POSTGRES_USER: user
+      POSTGRES_PASSWORD: testpassword
+