Fix: Add group write perms to /etc/redis (#4)

* Fix: Add group write perms to /etc/redis

By default OpenShift runs as a non-root user but the GID is always 0.  To allow `entrypoint.sh` to configure redis at container start, we need to change the permissions so that GID 0 users can modify `/etc/redis` and it's contents.
Signed-off-by: Brad Durrow <brad@nolab.org>

* Add /opt/redis with g+rwX for Openshift
Signed-off-by: Brad Durrow <brad@nolab.org>

Dockerfile

@@ -32,6 +32,9 @@ COPY setupMasterSlave.sh /usr/bin/setupMasterSlave.sh
 
 COPY healthcheck.sh /usr/bin/healthcheck.sh
 
+RUN mkdir -p /opt/redis/ && \
+    chmod -R g+rwX /etc/redis /opt/redis
+
 VOLUME ["/data"]
 
 WORKDIR /data