Add Ruby head

.circleci/config.yml

@@ -26,6 +26,33 @@ jobs:
           # Always install the latest versions available
           with-cache: false
       - ruby/rspec-test
+  test-ruby-head:
+    parameters:
+      rails-version:
+        type: string
+    docker:
+      - image: cimg/base:stable
+    environment:
+      RAILS_VERSION: <<parameters.rails-version>>
+    steps:
+      - checkout
+      - ruby/install:
+          # RVM wants Ruby 2 for some reason to install Ruby head
+          version: "2.7.8"
+      - ruby/install:
+          version: ruby-head
+      - run: |
+          rvm alias create default ruby-head
+          cat /home/circleci/.rvm/log/*/alias_create.log
+      - run: ruby --version
+      - ruby/install-deps:
+          # Have to set this since there's no lockfile
+          bundler-version: ">2"
+          # Do not use deployment mode, because we don't have a lockfile
+          path: "bundle"
+          # Always install the latest versions available
+          with-cache: false
+      - ruby/rspec-test
 
 workflows:
   test:
@@ -42,3 +69,10 @@ workflows:
                 - "~> 7.1.0"
                 - "~> 7.0.0"
                 - "~> 6.1.0"
+      - test-ruby-head:
+          matrix:
+            parameters:
+              rails-version:
+                - "~> 7.1.0"
+                - "~> 7.0.0"
+                - "~> 6.1.0"