ci(fedora41): tune RVM build to speedup and minimize the final image

- Do not waste time looking for pre-built images for Fedora.
  Tell to `rvm` to always build from sources.

- No need to update startup files (in the intermediate image).

- Exclude useless (documentation) files from the final archive.

.gitlab/ci/docker/fedora41/build_rvm.sh

@@ -2,17 +2,40 @@
 
 set -e
 
+echo "gem: --no-document" > ~/.gemrc
+
 gpg2 --keyserver hkps://keyserver.ubuntu.com \
      --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 \
                  7D2BAF1CF37B13E2069D6956105BD0E739499BDB
 
-curl -sSL https://get.rvm.io | bash -s stable
+curl -sSL https://get.rvm.io | bash -s stable --ignore-dotfiles
+
+export rvm_silence_banner=1
 
 # keep version in sync with `env_fedora*_makefiles.cmake`
-/usr/local/rvm/bin/rvm install ruby-3.0.4
+/usr/local/rvm/bin/rvm install ruby-3.0.4 --no-docs --disable-binary
 
-for p in archives examples gem-cache log src; do
+for p in archives docs examples gem-cache log src; do
     touch /usr/local/rvm/${p}/.tar_exclude
 done
 
-tar -C /usr/local --exclude-tag-under=.tar_exclude -cf /root/rvm.tar rvm
+cat <<EOF >/tmp/exclude.lst
+*LICENSE*
+*/doc/*
+*/man/*
+*.md
+BSDL
+CONTRIBUTING.*
+COPYING
+LEGAL
+PSFL
+README.rdoc
+History.rdoc
+gem_make.out
+test-unit-*/test
+rss-*/test
+EOF
+tar -C /usr/local \
+    --exclude-tag-under=.tar_exclude \
+    --exclude-from=/tmp/exclude.lst \
+    -cf /root/rvm.tar rvm