Add a CI file

.drone.yml

@@ -0,0 +1,9 @@
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: maven
+    image: 3-eclipse-temurin-17-alpine
+    commands:
+      - mvn test

pom.xml

@@ -9,8 +9,8 @@
     <version>1.0-SNAPSHOT</version>
 
     <properties>
-        <maven.compiler.source>18</maven.compiler.source>
-        <maven.compiler.target>18</maven.compiler.target>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
     </properties>
 
     <dependencies>