Fix Maven download in .gitlab-ci.yml

.gitlab-ci.yml

@@ -2,7 +2,10 @@ build:
   stage: build
   image: openjdk:8-jdk-slim
   before_script:
-    - wget http://www.us.apache.org/dist/maven/maven-3/3.0.5/binaries/apache-maven-3.0.5-bin.tar.gz
+    - export DEBIAN_FRONTEND="noninteractive"
+    - apt-get update
+    - apt-get install --assume-yes curl
+    - curl --location -o apache-maven-3.0.5-bin.tar.gz http://www.us.apache.org/dist/maven/maven-3/3.0.5/binaries/apache-maven-3.0.5-bin.tar.gz
     - tar -zxvf apache-maven-3.0.5-bin.tar.gz
     - export MAVEN_OPTS="-Xmx512m -XX:MaxPermSize=192m"
     - export M2_HOME=$PWD/apache-maven-3.0.5