Added persistent storage for MongoDB on Podman

[kiancross]

Closes #21.

[kiancross]

Failing because needs #209 merged in.

[codecov]

Codecov Report

Merging #210 (44a1652) into master (5f4ed08) will decrease coverage by 22.74%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #210       +/-   ##
===========================================
- Coverage   84.73%   61.98%   -22.75%     
===========================================
  Files          17      108       +91     
  Lines         334     1397     +1063     
  Branches       30      179      +149     
===========================================
+ Hits          283      866      +583     
- Misses         51      531      +480     

Flag	Coverage Δ
backend-core	94.44% <ø> (ø)
backend-federation-client	84.46% <ø> (ø)
backend-federation-server	68.96% <ø> (ø)
backend-internal-server	63.47% <ø> (?)
backend-ml	93.02% <ø> (?)
frontend	23.76% <ø> (?)
shared	100.00% <ø> (?)

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