fix: use publicly accessible maven docker image

Author: juniorode

docker-compose.yml

@@ -1,15 +1,6 @@
 services:
   maven:
-    image: maven.opendigitaleducation.com/docker/repository/sre-docker-hosted/mvn-java8-node20:latest
-    user: "$DEFAULT_DOCKER_USER"
-    working_dir: /usr/src/maven
-    volumes:
-      - ./:/usr/src/maven
-      - ~/.m2:/var/maven/.m2
-    environment:
-      MAVEN_CONFIG: /var/maven/.m2
-  maven21:
-    image: maven:3.9.9-eclipse-temurin-21-alpine
+    image: opendigitaleducation/mvn-java8-node20:latest
     user: "$DEFAULT_DOCKER_USER"
     working_dir: /usr/src/maven
     volumes: