The ruby post-install hook was not run for slim images

[eregon]

As we can see
https://github.com/graalvm/container/blob/952ceb4186763bd79c340b636adf89ca7267d2a5/truffleruby/Dockerfile.ol8-slim
doesn't run it, unlike

container/truffleruby/Dockerfile.ol8

Line 29 in 952ceb4

RUN /opt/truffleruby-$GRAALVM_VERSION-linux-amd64/lib/truffle/post_install_hook.sh

This then cause errors whenever the openssl gem is used, including just loading the gem.

Probably the easiest fix is to build the slim images from the non-slim images, and just don't copy the lib/llvm-toolchain.
Alternatively, installing the necessary packages to run the post-install hook, run it and uninstalling these packages might be another way.

[eregon]

This is still not fixed (EDIT: my mistake, I confused this with the RPM issue).

[eregon]

Slim and non-slim truffleruby Docker images for 22.3.0 now work on ol7 (uses /lib64/libssl.so.10), ol8 (uses /lib64/libssl.so.1.1), ol9 (uses /lib64/libssl.so.3), great!

[eregon]

2cb1a08#diff-84f2742614cf3abb76ac4f64e9b684a87dfb410468d883020f867f141605bd63 is the fix (for truffleruby/Dockerfile.ol8-slim).

The trade-off is that installs openssl-devel gcc make extra, which is no longer needed after running and that adds quite a bit of size (around 100-200MB IIRC).

[eregon]

I filed #68 for the size increase.