More documentation soon, but you can now install TruffleRuby without a click-through.
$ wget https://github.com/oracle/graal/releases/download/vm-1.0.0-rc1/graalvm-ce-1.0.0-rc1-linux-amd64.tar.gz
$ tar -zxf graalvm-ce-1.0.0-rc1-linux-amd64.tar.gz
$ export PATH=graalvm-1.0.0-rc1/bin:$PATH
$ gu install -c org.graalvm.ruby
$ ruby --version
truffleruby 1.0.0-rc1, like ruby 2.3.7 <native build with Graal> [x86_64-linux]
New documentation here, but I'll leave this issue open because we hope to simplify further.
https://github.com/oracle/truffleruby/blob/master/doc/user/installing.md
This is now done, for example for 1.0.0-RC2:
https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc2/truffleruby-1.0.0-rc2-linux-amd64.tar.gz
https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc2/truffleruby-1.0.0-rc2-macos-amd64.tar.gz
And those are used by Ruby installers (#1062).
The only remaining thing is documenting how to use these directly, for, e.g., testing in CI.
The standalone distribution, which is available publicly as GitHub releases, is now documented in https://github.com/oracle/truffleruby/blob/master/doc/user/standalone-distribution.md, as well as how to use it for testing in CI.
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More documentation soon, but you can now install TruffleRuby without a click-through.