[FlINK-36392] revert to cache mount type

Author: SamBarker

Dockerfile

@@ -25,9 +25,7 @@ WORKDIR /app
 
 COPY . .
 
-RUN --mount=type=bind,source=${MAVEN_HOME},target=/root/.m2 \
-     mvn -ntp clean install \
-    -pl flink-kubernetes-standalone,flink-kubernetes-operator-api,flink-kubernetes-operator,flink-autoscaler,flink-kubernetes-webhook -DskipTests=$SKIP_TESTS
+RUN --mount=type=cache,target=/root/.m2 mvn -ntp clean install -pl flink-kubernetes-standalone,flink-kubernetes-operator-api,flink-kubernetes-operator,flink-autoscaler,flink-kubernetes-webhook -DskipTests=$SKIP_TESTS
 
 RUN cd /app/tools/license; mkdir jars; cd jars; \
     cp /app/flink-kubernetes-operator/target/flink-kubernetes-operator-*-shaded.jar . && \