Add empty build spec and fix vanill build

[mariumof]

Description of changes:

Style and formatting:

I have run pre-commit install && pre-commit run --all-files to ensure that auto-formatting happens with every commit.

Issue number, if available

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[codecov-commenter]

Codecov Report

Merging #569 (05fc4a9) into master (7e0e4cf) will decrease coverage by 17.62%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #569       +/-   ##
===========================================
- Coverage   71.28%   53.65%   -17.63%     
===========================================
  Files         117      117               
  Lines       10693    10693               
===========================================
- Hits         7622     5737     -1885     
- Misses       3071     4956     +1885     

Impacted Files	Coverage Δ
smdebug/mxnet/__init__.py	0.00% <0.00%> (-100.00%)	:arrow_down:
smdebug/rules/__init__.py	0.00% <0.00%> (-100.00%)	:arrow_down:
smdebug/mxnet/singleton_utils.py	0.00% <0.00%> (-100.00%)	:arrow_down:
smdebug/rules/action/__init__.py	0.00% <0.00%> (-100.00%)	:arrow_down:
smdebug/rules/action/action.py	0.00% <0.00%> (-91.84%)	:arrow_down:
smdebug/core/reader.py	0.00% <0.00%> (-85.19%)	:arrow_down:
smdebug/rules/rule.py	0.00% <0.00%> (-82.36%)	:arrow_down:
smdebug/rules/action/message_action.py	0.00% <0.00%> (-81.93%)	:arrow_down:
smdebug/mxnet/hook.py	0.00% <0.00%> (-80.30%)	:arrow_down:
smdebug/core/s3_utils.py	20.00% <0.00%> (-80.00%)	:arrow_down:
... and 50 more

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