fix: using buildx for bentoctl build

[jjmachan]

Description

closes:

[codecov[bot]]

Codecov Report

Merging #165 (af94f3f) into main (54ca196) will increase coverage by 0.13%. The diff coverage is 31.25%.

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
+ Coverage   60.39%   60.52%   +0.13%     
==========================================
  Files          24       24              
  Lines        1121     1135      +14     
==========================================
+ Hits          677      687      +10     
- Misses        444      448       +4     

Flag	Coverage Δ
unit-tests	60.52% <31.25%> (+0.13%)	:arrow_up:

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Impacted Files	Coverage Δ
bentoctl/deployment_config.py	66.66% <0.00%> (ø)
bentoctl/operator/operator.py	71.23% <0.00%> (-3.06%)	:arrow_down:
bentoctl/docker_utils.py	23.07% <26.66%> (+3.07%)	:arrow_up:
bentoctl/utils/temp_dir.py	78.78% <37.50%> (+2.78%)	:arrow_up:
bentoctl/cli/__init__.py	84.78% <100.00%> (ø)

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[aarnphm]

close this since file changes need to changes I have added on the other PR.