Add a redis server to the CI testing containers

[jcpunk]

This should help us get kombu running as a multi process tool in the CI tests.

@vitodb if this looks right we'll need to rebuild the containers on docker hub and Jenkins.

[codecov]

Codecov Report

Merging #565 (97b334d) into master (9cbffe9) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #565      +/-   ##
==========================================
- Coverage   95.42%   95.39%   -0.03%     
==========================================
  Files          45       45              
  Lines        2688     2716      +28     
  Branches      445      442       -3     
==========================================
+ Hits         2565     2591      +26     
- Misses         90       91       +1     
- Partials       33       34       +1     

Flag	Coverage Δ
python-3.10	95.25% <ø> (-0.03%)	⬇️
python-3.6	95.04% <ø> (-0.07%)	⬇️

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Impacted Files	Coverage Δ
...rc/decisionengine/framework/modules/SourceProxy.py	78.26% <0.00%> (-8.70%)	⬇️
...ecisionengine/framework/taskmanager/TaskManager.py	98.37% <0.00%> (+1.59%)	⬆️

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[vitodb]

This looks good to me.
I'll rebuild the Docker container as soon as this PR is merged.