add .ruby-version

Signed-off-by: Jeff Mesnil <[email protected]>

.github/workflows/check_process.yml

@@ -19,6 +19,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
+          ruby-version: "3.2"
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
           cache-version: 0 # Increment this number if you need to re-download cached gems
       - name: Get all proposals files that have changed