Add helm chart and docker file

[rosesyrett]

Also add CI/CD for container images.

[codecov-commenter]

Codecov Report

Merging #9 (4422509) into master (c771ee5) will increase coverage by 0.98%.
The diff coverage is 91.86%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   86.31%   87.30%   +0.98%     
==========================================
  Files          25       25              
  Lines         519      520       +1     
==========================================
+ Hits          448      454       +6     
+ Misses         71       66       -5     

Impacted Files	Coverage Δ
src/diffcalc_API/stores/mongo.py	51.11% <33.33%> (ø)
src/diffcalc_API/stores/pickling.py	46.00% <33.33%> (ø)
src/diffcalc_API/services/hkl.py	95.08% <75.00%> (-4.92%)	⬇️
src/diffcalc_API/database.py	100.00% <100.00%> (ø)
src/diffcalc_API/errors/constraints.py	100.00% <100.00%> (ø)
src/diffcalc_API/errors/definitions.py	86.66% <100.00%> (-3.34%)	⬇️
src/diffcalc_API/errors/hkl.py	100.00% <100.00%> (ø)
src/diffcalc_API/errors/ub.py	100.00% <100.00%> (ø)
src/diffcalc_API/routes/ub.py	100.00% <100.00%> (+4.54%)	⬆️
src/diffcalc_API/services/constraints.py	96.55% <100.00%> (+7.66%)	⬆️
... and 6 more

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