DATAREDIS-1380 - Support Redis 4.0 for CI.

ci/Dockerfile

@@ -0,0 +1,17 @@
+FROM adoptopenjdk/openjdk8:latest
+
+RUN apt-get update
+
+# Get the tools for building Redis
+RUN apt-get install -y build-essential
+
+# Copy Spring Data Redis's Makefile into the container
+COPY ./Makefile /
+
+# Build Redis inside the container so we don't have to build it during the job.
+RUN make work/redis/bin/redis-cli work/redis/bin/redis-server
+
+RUN chmod -R o+rw work
+
+RUN apt-get clean \
+ && rm -rf /var/lib/apt/lists/*