Fixed failing setup for docs CI

The augeas Ruby gem 0.5.0 from rubygems.org is not compatible with Ruby 3.3
but the preinstalled RPM package is patched in OBS.
Confugure the bundler to use the system gems.

Copied from fac8bb6 by lslezak

And install rubygem(ruby-augeas) as RPM

.github/workflows/ci-doc-check.yml

@@ -52,7 +52,7 @@ jobs:
     - name: Install Ruby development files and XML tooling
       run: zypper --non-interactive install --no-recommends
            gcc gcc-c++ make libopenssl-devel ruby-devel augeas-devel diff
-           libxslt-devel libxml2-devel xmlstarlet
+           libxslt-devel libxml2-devel xmlstarlet 'rubygem(ruby-augeas)'
 
     - name: Cache RubyGems
       uses: actions/cache@v3
@@ -64,7 +64,7 @@ jobs:
       env:
         NOKOGIRI_USE_SYSTEM_LIBRARIES: 1
       run: |
-        bundle config set --local path 'vendor/bundle'
+        bundle config set --local disable_shared_gems 0
         bundle install
       working-directory: ./service