Suggest running heroku login on missing creds

[mike0sv]

closes #501

[codecov]

Codecov Report

Base: 87.99% // Head: 86.46% // Decreases project coverage by -1.52% ⚠️

Coverage data is based on head (37b5b32) compared to base (75e2074).
Patch coverage: 89.24% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #503      +/-   ##
==========================================
- Coverage   87.99%   86.46%   -1.53%     
==========================================
  Files          96       96              
  Lines        8282     8654     +372     
==========================================
+ Hits         7288     7483     +195     
- Misses        994     1171     +177     

Impacted Files	Coverage Δ
mlem/contrib/rabbitmq.py	53.08% <37.50%> (-45.71%)	⬇️
mlem/contrib/heroku/utils.py	88.88% <50.00%> (+8.56%)	⬆️
mlem/contrib/sagemaker/runtime.py	80.64% <71.42%> (+0.98%)	⬆️
mlem/contrib/fastapi.py	84.74% <76.19%> (-11.09%)	⬇️
mlem/runtime/client.py	84.84% <79.41%> (-5.95%)	⬇️
mlem/contrib/lightgbm.py	94.35% <81.81%> (+0.23%)	⬆️
mlem/runtime/server.py	88.31% <88.23%> (+3.01%)	⬆️
mlem/core/data_type.py	92.63% <89.61%> (-2.93%)	⬇️
mlem/runtime/interface.py	87.50% <93.18%> (+2.39%)	⬆️
mlem/contrib/torch.py	93.91% <95.00%> (+0.16%)	⬆️
... and 15 more

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