Docker image with downloaded prerequisites

[blitz-1306]

Changes

• Introduced docker directory with instructions to predownload native compilers, build docker image and set ENV to use them during the tests instead of downloading compilers on-demand. This will boost our CI and also may be used for tests in dependend packages.

Commands

cd docker

# Build image
docker build -t <name>:<tag> .

# Explore image
docker run -it <name>:<tag> sh

# Publish image
docker image push <...>

Notes

• It is still needed to decide what registry to use for uploading and hosting the image.
• We may also introduce scripts in package.json to simplify image building and publishing steps, or consider possible automation options.

Regards.

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #89 (fee415e) into native_compilers (e75ff29) will increase coverage by 0.07%.
The diff coverage is n/a.

❗ Current head fee415e differs from pull request most recent head ffd683e. Consider uploading reports for the commit ffd683e to get more accurate results

@@                 Coverage Diff                  @@
##           native_compilers      #89      +/-   ##
====================================================
+ Coverage             92.16%   92.23%   +0.07%     
====================================================
  Files                   253      246       -7     
  Lines                  5179     5033     -146     
  Branches                815      800      -15     
====================================================
- Hits                   4773     4642     -131     
+ Misses                  258      249       -9     
+ Partials                148      142       -6     

Impacted Files	Coverage Δ
src/ast/modern/throw_processor.ts	40.00% <0.00%> (-60.00%)	⬇️
src/ast/modern/modifier_definition_processor.ts	93.33% <0.00%> (-6.67%)	⬇️
src/ast/modern/contract_definition_processor.ts	95.00% <0.00%> (-5.00%)	⬇️
src/ast/modern/function_definition_processor.ts	95.45% <0.00%> (-4.55%)	⬇️
src/ast/modern/variable_declaration_processor.ts	91.66% <0.00%> (-4.17%)	⬇️
src/ast/ast_node_factory.ts	71.08% <0.00%> (-3.75%)	⬇️
src/compile/compiler_selection.ts	82.50% <0.00%> (-0.84%)	⬇️
src/compile/utils.ts	90.58% <0.00%> (-0.72%)	⬇️
src/types/abi.ts	80.30% <0.00%> (ø)
src/compile/index.ts	100.00% <0.00%> (ø)
... and 10 more

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[cd1m0]

LGTM