ci: use asdf for readthedocs (#165)

ci: try asdf for readthedocs

Author: henryiii

.readthedocs.yml

@@ -9,8 +9,9 @@ version: 2
 build:
   os: ubuntu-22.04
   commands:
-    - gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 409b6b1796c275462a1703113804bb82d39dc0e3 7d2baf1cf37b13e2069d6956105bd0e739499bdb && curl -sSL https://get.rvm.io | bash -s stable
-    - ~/.rvm/bin/rvm autolibs disable && ~/.rvm/bin/rvm install ruby 3.1.2
-    - PATH="$HOME/.rvm/rubies/ruby-3.1.2/bin:$PATH" gem install bundler
-    - PATH="$HOME/.rvm/rubies/ruby-3.1.2/bin:$PATH" bundle install
-    - PATH="$HOME/.rvm/rubies/ruby-3.1.2/bin:$PATH" bundle exec jekyll build --destination _readthedocs/html --baseurl $(echo -n "$READTHEDOCS_CANONICAL_URL" | cut -d '/' -f 4-)
+    - asdf plugin add ruby https://github.com/asdf-vm/asdf-ruby.git
+    - asdf install ruby 3.1.2
+    - asdf global ruby 3.1.2
+    - gem install bundler
+    - bundle install
+    - bundle exec jekyll build --destination _readthedocs/html --baseurl $(echo -n "$READTHEDOCS_CANONICAL_URL" | cut -d '/' -f 4-)