build fails

[MartinDerHettich]

docker-compose build

fails with a nasty ERROR somewhere over the rainbow inside the Amazon-Cloud:

Step 18/20 : RUN rbenv install && rbenv rehash && gem install bundler:2.2.32 && rbenv rehash && bundle install && jruby -v && java -version && touch config/environments/development_secret.rb config/environments/production_secret.rb config/environments/test_secret.rb
 ---> Running in e0345d7d8a92
Downloading jruby-dist-9.2.20.1-bin.tar.gz...
-> https://dqw8nmjcqpjn7.cloudfront.net/79cdbc475a7041f4b44766c069051d21dd2473ce1638a0b668aa9439fb631963
Installing jruby-9.2.20.1...

BUILD FAILED (Ubuntu 20.04 using ruby-build 20211203)

Inspect or clean up the working tree at /tmp/ruby-build.20230823133801.24.DbwZ7v
Results logged to /tmp/ruby-build.20230823133801.24.log

Last 10 log lines:
Server: AmazonS3
X-Cache: Hit from cloudfront
Via: 1.1 03d509e8374e9f42668961b5e0201348.cloudfront.net (CloudFront)
X-Amz-Cf-Pop: FRA2-C2
X-Amz-Cf-Id: OBzAnmuAbwzm1MAcvKnHagtgXA3i_udlhQy6qn7nr3Az6p2uRafduA==
Age: 1434

/tmp/ruby-build.20230823133801.24.DbwZ7v/jruby-9.2.20.1 /tmp/ruby-build.20230823133801.24.DbwZ7v ~/sosol
ERROR:  Could not find a valid gem 'jruby-launcher' (>= 0) in any repository
ERROR:  Possible alternatives: jruby-launcher
ERROR: Service 'sosol' failed to build : The command '/bin/sh -c rbenv install && rbenv rehash && gem install bundler:2.2.32 && rbenv rehash && bundle install && jruby -v && java -version && touch config/environments/development_secret.rb config/environments/production_secret.rb config/environments/test_secret.rb' returned a non-zero code: 1

Of course I cannot read "Results logged to /tmp/ruby-build.20230823133801.24.log" because it's inside a cloud far, far away...