[AIRFLOW-5585] Remove docker context from build

[potiuk]

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Tests

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[codecov-io]

Codecov Report

Merging #6239 into master will decrease coverage by 0.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6239      +/-   ##
==========================================
- Coverage   80.06%   79.71%   -0.36%     
==========================================
  Files         610      610              
  Lines       35261    35441     +180     
==========================================
+ Hits        28231    28251      +20     
- Misses       7030     7190     +160

Impacted Files	Coverage Δ
airflow/executors/sequential_executor.py	47.61% <0%> (-52.39%)	⬇️
airflow/contrib/utils/sendgrid.py	68.91% <0%> (-19.02%)	⬇️
airflow/models/baseoperator.py	79.08% <0%> (-16.2%)	⬇️
airflow/utils/log/colored_log.py	81.81% <0%> (-11.37%)	⬇️
airflow/utils/sqlalchemy.py	86.44% <0%> (-6.78%)	⬇️
airflow/executors/__init__.py	63.26% <0%> (-4.09%)	⬇️
airflow/utils/dag_processing.py	54.13% <0%> (-2.59%)	⬇️
airflow/jobs/scheduler_job.py	73.19% <0%> (-1.21%)	⬇️
airflow/models/taskinstance.py	93.24% <0%> (-0.51%)	⬇️

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