Trim ruby docker image a few Mgs (#14518)

Added `--disable-install-doc --disable-install-rdoc
--disable-install-capi` to the `configure` command in `install_ruby.sh`
to prevent installing documentation, which reduces the image size and
build time.

---
*PR created automatically by Jules for task
[8743311891245901013](https://jules.google.com/task/8743311891245901013)
started by @jonathanmetzman*

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: google-labs-jules[bot]

infra/base-images/base-builder/install_ruby.sh

@@ -22,7 +22,7 @@ apt update && apt install -y $RUBY_DEPS
 curl -O https://cache.ruby-lang.org/pub/ruby/3.3/ruby-$RUBY_VERSION.tar.gz
 tar -xvf ruby-$RUBY_VERSION.tar.gz
 cd ruby-$RUBY_VERSION
-./configure
+./configure --disable-install-doc --disable-install-rdoc --disable-install-capi
 make -j$(nproc)
 make install
 cd ../