Unable to install bundler due to certificate error

[wallymathieu]

docker image variants: 3, 3.2.2, 3.3-rc-buster

 > [14/15] RUN gem install bundler:
#0 0.648 ERROR:  SSL verification error at depth 0: self signed certificate (18)
#0 0.648 ERROR:  Certificate /C=US/ST=USA/L=New York/O=Optimization/OU=Optimization/CN=tomcat is not trusted
#0 0.818 ERROR:  SSL verification error at depth 0: self signed certificate (18)
#0 0.818 ERROR:  Certificate /C=US/ST=USA/L=New York/O=Optimization/OU=Optimization/CN=tomcat is not trusted
#0 1.093 ERROR:  SSL verification error at depth 0: self signed certificate (18)
#0 1.093 ERROR:  Certificate /C=US/ST=USA/L=New York/O=Optimization/OU=Optimization/CN=tomcat is not trusted
#0 1.093 ERROR:  Could not find a valid gem 'bundler' (>= 0), here is why:
#0 1.093           Unable to download data from https://rubygems.org/ - SSL_connect returned=1 errno=0 peeraddr=62.74.130.28:443 state=error: certificate verify failed (self signed certificate) (https://rubygems.org/specs.4.8.gz)
#0 1.300 ERROR:  SSL verification error at depth 0: self signed certificate (18)
#0 1.300 ERROR:  Certificate /C=US/ST=USA/L=New York/O=Optimization/OU=Optimization/CN=tomcat is not trusted
#0 1.542 ERROR:  SSL verification error at depth 0: self signed certificate (18)
#0 1.542 ERROR:  Certificate /C=US/ST=USA/L=New York/O=Optimization/OU=Optimization/CN=tomcat is not trusted
------
failed to solve: process "/bin/sh -c gem install bundler" did not complete successfully: exit code: 2

[wallymathieu]

Seems like this is due to Vodafone Secure Net blocking rubygems.

[wallymathieu]

I'm closing this issue due to it being a problem with RubyGems and ISP erronously blocking RubyGems
rubygems/rubygems.org#3822