docker to regenerate files

[stepancheg]

Regenerate script should produce identical output regardless of how developer machine is configured.

capnp project does not provide prebuilt binaries (capnproto/capnproto#2607), so building in docker is second best option. The downside, it requires docker. Works on mac too, if docker-mac is installed.

Running both regenerate scripts, produce no changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.99%. Comparing base (ab342b3) to head (2aef798).
⚠️ Report is 276 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #639      +/-   ##
==========================================
- Coverage   51.64%   50.99%   -0.65%     
==========================================
  Files          69       71       +2     
  Lines       33735    32498    -1237     
==========================================
- Hits        17422    16572     -850     
+ Misses      16313    15926     -387     

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