[Extended Authentication] Enable usage of system properties for HttpClient

[sebastiankirsch]

This allows using Extended Authentication behind a proxy, as it advices
the HttpClient to use the JVM's standard system properties for
proxies (https://docs.oracle.com/javase/6/docs/technotes/guides/net/proxies.html).

[codecov]

Codecov Report

Merging #897 into master will not change coverage.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master     #897   +/-   ##
=========================================
  Coverage     50.98%   50.98%           
  Complexity     1213     1213           
=========================================
  Files           140      140           
  Lines          7129     7129           
  Branches        956      956           
=========================================
  Hits           3635     3635           
  Misses         3178     3178           
  Partials        316      316

Impacted Files	Coverage Δ	Complexity Δ
...bric8/maven/docker/access/ecr/EcrExtendedAuth.java	92.68% <0%> (ø)	8 <0> (ø)	⬇️

[sebastiankirsch]

To test this, I'd have to use wiremock or something similar, and I'm not sure if that's really worth the effort - but I can look into this if required...

[rhuss]

I don't think its worth the effort as it simply would test http client which we are using. I'm perfectly fine with this PR, thanks ;-)

[sebastiankirsch]

Any chance for a new release?
Since we're sitting behind a corporate proxy, we can't use that feature otherwise.

[rhuss]

@sebastiankirsch I plan a release until the end of the week. sorry for the delay ...

[rhuss]

@sebastiankirsch 0.24.0 has been just released. sorry for the delay.

[sebastiankirsch]

Thank you!
Now we can finally get rid of these bash scripts that build & push to AWS ECR.