feat: add extra hosts option

[Haegi]

Context

At the moment gnomock doesn't support adding extra hosts to the container.
This PR adds a WithExtraHosts option, which implements exactly that.
If the option is provided, the extra hosts will be added to the container and otherwise it will just receive an empty array and it will do nothing with it.

Notes

I am not sure on a proper test for it.
Maybe I could run some busybox and check if the specified host is reachable.

Tests:

• ping with extra host (success)
• ping without extra host (failure)
• ping with extra host to other domain (success)

[orlangure]

Hi @Haegi and thank you for the contribution! I wasn't aware of this flag, this is really cool!
I like your suggested test scenario. Can you update the PR with it?
Thanks!😻

[codecov-commenter]

Codecov Report

Base: 86.09% // Head: 65.71% // Decreases project coverage by -20.37% ⚠️

Coverage data is based on head (b26ec39) compared to base (e685fca).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #755       +/-   ##
===========================================
- Coverage   86.09%   65.71%   -20.38%     
===========================================
  Files          49       49               
  Lines        2315     2319        +4     
===========================================
- Hits         1993     1524      -469     
- Misses        167      687      +520     
+ Partials      155      108       -47     

Impacted Files	Coverage Δ
docker.go	91.34% <100.00%> (+0.90%)	⬆️
options.go	100.00% <100.00%> (ø)
preset/kafka/options.go	0.00% <0.00%> (-100.00%)	⬇️
preset/splunk/options.go	0.00% <0.00%> (-100.00%)	⬇️
preset/cassandra/options.go	0.00% <0.00%> (-100.00%)	⬇️
preset/localstack/options.go	0.00% <0.00%> (-100.00%)	⬇️
preset/splunk/preset.go	1.66% <0.00%> (-95.00%)	⬇️
preset/localstack/preset.go	1.16% <0.00%> (-91.87%)	⬇️
preset/cassandra/preset.go	3.44% <0.00%> (-89.66%)	⬇️
preset/kafka/preset.go	0.74% <0.00%> (-78.36%)	⬇️
... and 3 more

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[Haegi]

Hi @Haegi and thank you for the contribution! I wasn't aware of this flag, this is really cool! I like your suggested test scenario. Can you update the PR with it? Thanks!😻

I just added some tests and I also adapted the PR description.
However somehow the k3s tests fail (also locally without the change in my case). Do you have any idea about it or should I have a deeper look at it?

[orlangure]

I'll take a look, I guess something broke in k3s preset😿

[Haegi]

I'll take a look, I guess something broke in k3s preset😿

Thanks :)

[orlangure]

Hey, I fixed the k3s preset issue in #760, please rebase from master, the build should be OK😼

[Haegi]

Hey, I fixed the k3s preset issue in #760, please rebase from master, the build should be OK😼

Thanks @orlangure! I rebased from master but it seems like the github action is now broken. Is this because of my change and should I have a look at it?

[orlangure]

@Haegi, no this is just a flaky job that I don't have capacity to look into. I will merge and prepare a release this weekend, everything looks great. Thank you!