E2E tests: ruby: remove sinatra gem install and GEM_HOME env var #1990
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The ruby_3.1.2 package already includes the sinatra gem, thus it is not necessary to install it locally in order to run a Ruby web server. This change removes the sinatra gem installation step in the Rubty e2e test; in addition, the GEM_HOME environment variable is being removed from the Ops configuration file because the Ruby package already provides a correct value for this variable (consistent with the contents of the package).
This change fixes a 'Sinatra could not start, the "rackup" gem was not found' error that occurs when trying to run the (locally installed) latest release of the sinatra gem during the e2e tests.