CI: Introduce ruby_versions.yml to add supported Ruby versions automatically

.github/workflows/linux.yml

@@ -1,14 +1,26 @@
 name: linux
 on:
-  - push
-  - pull_request
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+  schedule:
+    - cron: '0 0 1 * *'
 jobs:
+  ruby-versions:
+    uses: ruby/actions/.github/workflows/ruby_versions.yml@master
+    with:
+      engine: cruby
+      min_version: 2.7
   build:
+    needs: ruby-versions
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', '4.0' ]
+        ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
+        exclude:
+          - ruby: head
         postgres: [ '9', '10', '11', '12', '13' ]
         os:
           - ubuntu-latest
@@ -26,7 +38,7 @@ jobs:
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5
-    name: Ruby ${{ matrix.ruby }} unit testing on ${{ matrix.os }}
+    name: Ruby ${{ matrix.ruby }} unit testing with PostgreSQL ${{ matrix.postgres }}
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
     - uses: ruby/setup-ruby@6ca151fd1bfcfd6fe0c4eb6837eb0584d0134a0c # v1.290.0