Use OpenJDK8's official Alpine image. (#51)

Author: mccheah

resource-managers/kubernetes/docker-minimal-bundle/src/main/docker/driver/Dockerfile

@@ -1,9 +1,11 @@
-FROM anapsix/alpine-java:8
+FROM openjdk:8-alpine
 
 # If this docker file is being used in the context of building your images from a Spark distribution, the docker build
 # command should be invoked from the top level directory of the Spark distribution. E.g.:
 # docker build -t spark-driver:latest -f dockerfiles/driver/Dockerfile .
 
+RUN apk upgrade --update
+RUN apk add --update bash
 RUN mkdir -p /opt/spark
 RUN touch /opt/spark/RELEASE
 

resource-managers/kubernetes/docker-minimal-bundle/src/main/docker/executor/Dockerfile

@@ -1,9 +1,11 @@
-FROM anapsix/alpine-java:8
+FROM openjdk:8-alpine
 
 # If this docker file is being used in the context of building your images from a Spark distribution, the docker build
 # command should be invoked from the top level directory of the Spark distribution. E.g.:
 # docker build -t spark-executor:latest -f dockerfiles/executor/Dockerfile .
 
+RUN apk upgrade --update
+RUN apk add --update bash
 RUN mkdir -p /opt/spark
 RUN touch /opt/spark/RELEASE