fixed maven version not being new enough for a lot of projects

Dockerfile

@@ -1,8 +1,11 @@
-FROM openjdk:11-jdk-slim
+FROM maven:3.9.9-eclipse-temurin-11
+
+# Set Maven repository location
+ENV MAVEN_CONFIG=/root/.m2
 
 # Install dependencies
 RUN apt-get update && \
-    apt-get install -y maven wget unzip curl zip && \
+    apt-get install -y wget unzip curl zip git && \
     rm -rf /var/lib/apt/lists/*
 
 # Install Gradle