New --config-file option in redis-node + configmap support in helm chart

[clamoriniere1A]

Fixes: #19

Add new redis-node option for including redis configuration files in the generated redis-conf file.

Files will be added at the end of the default file. like this those additional configuration files will be able to overwrite default values or value already set.

[codecov-io]

Codecov Report

Merging #22 into master will decrease coverage by 0.06%. The diff coverage is 38.09%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
- Coverage   37.08%   37.01%   -0.07%     
==========================================
  Files          37       37              
  Lines        3422     3420       -2     
==========================================
- Hits         1269     1266       -3     
+ Misses       2036     2034       -2     
- Partials      117      120       +3

Impacted Files	Coverage Δ
pkg/redisnode/config.go	0% <ø> (ø)	:arrow_up:
pkg/redisnode/node.go	55% <33.33%> (-5.26%)	:arrow_down:
pkg/redisnode/redisnode.go	26.73% <66.66%> (ø)	:arrow_up:

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[killmeplz]

I guess you use a configmap to do that. I will do a PR later today

[clamoriniere1A]

@killmeplz yes the idea is to add a ConfigMap VolumeMount in a RedisCluster.Spec.PodTemplate and provide the file path in the Volume mountPath as an argument of the redis-node container process.