Optimize Docker caching

[sergeymakinen]

No description provided.

[codecov]

Codecov Report

Merging #3 (55d2b7e) into bugfix/libreswan (6808659) will not change coverage.
The diff coverage is n/a.

@@                Coverage Diff                @@
##           bugfix/libreswan       #3   +/-   ##
=================================================
  Coverage             87.74%   87.74%           
=================================================
  Files                     5        5           
  Lines                   612      612           
=================================================
  Hits                    537      537           
  Misses                   59       59           
  Partials                 16       16           

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