Wait strategies must poll ports

[programminh]

Docker engine 20.10.3 has changed the way ports are returned from InspectContainer. The array is not always populated which triggers a panic.

Related to #294

[codecov]

Codecov Report

Merging #295 (4e4e126) into master (6467d9b) will decrease coverage by 1.09%.
The diff coverage is 23.33%.

@@            Coverage Diff             @@
##           master     #295      +/-   ##
==========================================
- Coverage   64.04%   62.95%   -1.10%     
==========================================
  Files          13       13              
  Lines         865      880      +15     
==========================================
  Hits          554      554              
- Misses        226      242      +16     
+ Partials       85       84       -1     

Impacted Files	Coverage Δ
wait/sql.go	0.00% <0.00%> (ø)
wait/http.go	56.04% <28.57%> (-1.43%)	⬇️
wait/host_port.go	56.14% <30.76%> (-4.28%)	⬇️
docker.go	65.20% <33.33%> (-0.62%)	⬇️

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[gianarb]

Thanks!! good catch, I think caching without invalidation was for sure a poor choice I have made

[butuzov]

hi, @gianarb any plans on releasing this?
I needed to go full circle (from stepping on this issue in the new project to forking repo in order to fix it, only to find it's done by @programminh ). it's really desired fix.