fix(quarkus): use quarkus-extension-maven-plugin (camunda#3359)

This plugin is needed to fill in the missing parts in the extension descriptor.

---------

Co-authored-by: Tassilo Weidner <3015690+tasso94@users.noreply.github.com>

quarkus-extension/engine/runtime/pom.xml

@@ -45,13 +45,23 @@
   </dependencies>
 
   <build>
-    <resources>
-      <resource>
-        <directory>src/main/resources</directory>
-        <filtering>true</filtering>
-      </resource>
-    </resources>
     <plugins>
+      <plugin>
+        <groupId>io.quarkus</groupId>
+        <artifactId>quarkus-extension-maven-plugin</artifactId>
+        <version>${version.quarkus}</version>
+        <executions>
+          <execution>
+            <phase>compile</phase>
+            <goals>
+              <goal>extension-descriptor</goal>
+            </goals>
+            <configuration>
+              <deployment>${project.groupId}:${project.artifactId}-deployment:${project.version}</deployment>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>      
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
         <configuration>

quarkus-extension/engine/runtime/src/main/resources/META-INF/quarkus-extension.yaml

@@ -1,16 +1,16 @@
 ---
 artifact: ${project.groupId}:${project.artifactId}:${project.version}
-name: "Camunda Platform Engine"
-description: "Quarkus Extension for the Camunda Platform Engine"
+name: "Camunda Platform 7 Engine"
+description: "Quarkus Extension for the Camunda Platform 7 Engine"
 metadata:
   keywords:
     - "camunda"
-    - "camunda-platform"
+    - "camunda-7"
+    - "camunda-platform-7"
     - "processes"
     - "decisions"
     - "bpmn"
     - "dmn"
-  guide: "https://docs.camunda.org/manual/"
+  guide: "https://docs.camunda.org/manual/latest/user-guide/quarkus-integration/"
   categories:
     - "business-automation"
-  status: "preview"