[Jenkins-infra] cannot fetch rubygems for jenkins.io local build

[Martin d'Anjou]

Hi,

In my jenkins.io clone, I am trying to run "make run" and "make site" but I
am running into this error:
./scripts/ruby pull
2.6: Pulling from library/ruby
Digest:
sha256:0048434fd0ea67f0c8fc5d959a38751fced429c3c80c28e293518486f9039723
Status: Image is up to date for ruby:2.6
./scripts/ruby bundle install --path=vendor/gems
Fetching source index from https://rubygems.org/

Retrying fetcher due to error (2/4): Bundler::HTTPError Could not fetch
specs from https://rubygems.org/
Retrying fetcher due to error (3/4): Bundler::HTTPError Could not fetch
specs from https://rubygems.org/
Retrying fetcher due to error (4/4): Bundler::HTTPError Could not fetch
specs from https://rubygems.org/
Could not fetch specs from https://rubygems.org/
Makefile:81: recipe for target 'build/ruby' failed
make: *** [build/ruby] Error 17

Can you help?

Martin
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