create MlemSource to choose how mlem is added to docker

[mike0sv]

close #345

[codecov]

Codecov Report

Base: 89.51% // Head: 89.40% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (e9ae8b4) compared to base (8a409c8).
Patch coverage: 79.83% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
- Coverage   89.51%   89.40%   -0.12%     
==========================================
  Files          81       81              
  Lines        6276     6342      +66     
==========================================
+ Hits         5618     5670      +52     
- Misses        658      672      +14     

Impacted Files	Coverage Δ
mlem/cli/dev.py	50.00% <0.00%> (ø)
mlem/cli/main.py	65.48% <0.00%> (-1.18%)	⬇️
mlem/contrib/docker/context.py	85.83% <83.80%> (-1.03%)	⬇️
mlem/utils/entrypoints.py	84.50% <100.00%> (+0.92%)	⬆️

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[aguschin]

This closes #345 if I'm correct. Right @mike0sv ?

[mike0sv]

Lol yes
I forgot that we have it already as an issue :)

[aguschin]

LGTM!