Add WithRegistry option

[bdandy]

Because of DockerHub limits sometimes we need to set our own registry to download localstack.

[elgohr]

Hi, thank you for the PR. Could you please provide tests?

[codecov[bot]]

Codecov Report

Merging #569 (b1cd7f1) into main (f37d98e) will decrease coverage by 2.92%. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #569      +/-   ##
==========================================
- Coverage   97.63%   94.71%   -2.93%     
==========================================
  Files           2        2              
  Lines         254      265      +11     
==========================================
+ Hits          248      251       +3     
- Misses          4       11       +7     
- Partials        2        3       +1     

Impacted Files	Coverage Δ
localstack.go	94.61% <33.33%> (-2.98%)	:arrow_down:

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[elgohr]

@bdandy ping

[bdandy]

It seems like changes were added to build image instead of fetching it, so MR won't work anymore

[elgohr]

So we can close this here?

[bdandy]

It seems like with new code it's not possible to choose a registry to build the docker container from (for example gitlab proxy), like it was before.

I'm not sure why it was changed to build container instead of pull.

Anyway this can be closed