Add Docker support and update Java version to 21

pom.xml

@@ -27,7 +27,7 @@
         <url/>
     </scm>
     <properties>
-        <java.version>25</java.version>
+        <java.version>21</java.version>
     </properties>
     <dependencies>
         <dependency>
@@ -70,7 +70,8 @@
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
-            <scope>provided</scope>
+            <version>1.18.30</version>
+            <scope>compile</scope>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
@@ -120,6 +121,23 @@
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
+            <!-- Ensure Lombok annotation processing during Maven compile inside Docker -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.11.0</version>
+                <configuration>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                            <version>1.18.30</version>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>