use newer maven
align with brooklyn root project dockerfile
diff --git a/Dockerfile b/Dockerfile
index ca7afef..dd0bfc9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,14 +15,15 @@
# specific language governing permissions and limitations
# under the License.
-FROM maven:3.5.2-jdk-8-alpine
+FROM maven:3.8.6-eclipse-temurin-8
# Install necessary binaries to build brooklyn-dist
-RUN apk add --no-cache git rpm dpkg
+#RUN apk add --no-cache git rpm dpkg
+RUN apt-get update && apt-get install -y git rpm dpkg
# Make sure the /var/tmp (for RPM build) is writable for all users
RUN mkdir -p /var/tmp/ && chmod -R 777 /var/tmp/
# Make sure the /var/maven is writable for all users
RUN mkdir -p /var/maven/.m2/ && chmod -R 777 /var/maven/
-ENV MAVEN_CONFIG=/var/maven/.m2
\ No newline at end of file
+ENV MAVEN_CONFIG=/var/maven/.m2
