Bookworm and Ruby 3.0: Use system root CAs

Clemens Beckrequested to merge
fix-bookworm-ruby-3-0-root-certs into master

What does this MR do and why?

Link the system certificate directory to the custom OpenSSL certificate directory. Fixes cert chain errors for HTTP requests sent from Ruby.

Relates #132 (closed)

Relates gitlab#441409 (closed)

Test notes: !750 (comment 1768980317)

Checklist

Edited by Clemens Beck

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