Add wait.ExecStrategy to wait on cmd exec in a container

[alexey-medvedchikov]

The work is heavily based on wait.HttpStrategy.

This is especially useful with localstack/localstack as the readiness of the HTTP API doesn't actually mean anything, you can still get HTTP 500 on request while checking with some kind of client (or a script) with complete logic can give one confident result.

[codecov]

Codecov Report

Merging #368 (05f3d42) into master (1b9fe0b) will increase coverage by 0.51%.
The diff coverage is 92.00%.

@@            Coverage Diff             @@
##           master     #368      +/-   ##
==========================================
+ Coverage   62.66%   63.17%   +0.51%     
==========================================
  Files          15       16       +1     
  Lines        1015     1040      +25     
==========================================
+ Hits          636      657      +21     
- Misses        280      284       +4     
  Partials       99       99              

Impacted Files	Coverage Δ
wait/exec.go	92.00% <92.00%> (ø)
docker.go	65.42% <0.00%> (-0.83%)	⬇️
wait/http.go	61.45% <0.00%> (+2.08%)	⬆️

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[mdelapenya]

Hey @alexey-medvedchikov, sorry for the delay in the response, and thanks for this new wait strategy.

I've reviewed and I do not see anything weird. I already approved the GH action run, so let's check how it finishes 🤞

[alexey-medvedchikov]

@mdelapenya Pleasure for me to contribute. I implemented this strategy in the code of our project, and it is really nice to have the possibility to make our own, nice API! Hope to see this in the next version to cut some code of ours. 👍

[mdelapenya]

Merged, thanks!

[dlsrb6342]

@mdelapenya
When will this feature released?