Fix RTD build

.readthedocs.yml

@@ -9,8 +9,11 @@ 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-)

Gemfile

@@ -37,3 +37,5 @@ gem "webrick", "~> 1.7"
 gem "jekyll-remote-theme", "~> 0.4.3"
 
 gem 'jekyll-redirect-from'
+
+gem 'jekyll-include-cache'

Gemfile.lock

@@ -31,6 +31,8 @@ GEM
       terminal-table (~> 2.0)
     jekyll-feed (0.16.0)
       jekyll (>= 3.7, < 5.0)
+    jekyll-include-cache (0.2.1)
+      jekyll (>= 3.7, < 5.0)
     jekyll-redirect-from (0.16.0)
       jekyll (>= 3.3, < 5.0)
     jekyll-remote-theme (0.4.3)
@@ -83,6 +85,7 @@ DEPENDENCIES
   http_parser.rb (~> 0.6.0)
   jekyll (~> 4.2.2)
   jekyll-feed (~> 0.12)
+  jekyll-include-cache
   jekyll-redirect-from
   jekyll-remote-theme (~> 0.4.3)
   just-the-docs

_config.yml

@@ -51,6 +51,7 @@ plugins:
   - jekyll-feed
   - jekyll-remote-theme
   - jekyll-redirect-from
+  - jekyll-include-cache
 
 # Exclude from processing.
 # The following items will not be processed, by default.