ci: add Ruby 4.0 to the test matrix

Author: dmke

.github/workflows/main.yml

@@ -10,14 +10,16 @@ jobs:
     name: Ruby ${{ matrix.ruby }}/Rails ${{ matrix.rails }}
     strategy:
       matrix:
-        ruby:  ['3.2', '3.3', '3.4']
+        ruby:  ['3.2', '3.3', '3.4', '4.0']
         rails: ['7.0', '7.1', '7.2', '8.0', '8.1']
         exclude:
           # Rails < 7.2 is incompat with Ruby 3.3+
           - { ruby: '3.3', rails: '7.0' }
           - { ruby: '3.3', rails: '7.1' }
           - { ruby: '3.4', rails: '7.0' }
           - { ruby: '3.4', rails: '7.1' }
+          - { ruby: '4.0', rails: '7.0' }
+          - { ruby: '4.0', rails: '7.1' }
       fail-fast: false # applies to matrix
     continue-on-error: true # applies to job
 

.github/workflows/rails-main.yml

@@ -10,7 +10,7 @@ jobs:
     name: Ruby ${{ matrix.ruby }}/Rails ${{ matrix.rails }}
     strategy:
       matrix:
-        ruby:  ['3.2', '3.3', '3.4']
+        ruby:  ['3.2', '3.3', '3.4', '4.0']
         rails: ['main']
 
     env:

README.md

@@ -16,14 +16,14 @@ The following Rails and Ruby versions[^1] are supported
 [and tested](https://github.com/digineo/texd-ruby/actions/workflows/main.yml?query=branch%3Amaster);
 older versions of Ruby and Rails *may* work, but this is not guaranteed.
 
-| ↓ Rails / Ruby → | 3.2 | 3.3 | 3.4 | Notes   |
-|-----------------:|:----|:----|:----|:--------|
-| 7.0              | ✅  | ❌  | ❌  | (1) |
-| 7.1              | ✅  | ❌  | ❌  | (1) |
-| 7.2              | ✅  | ✅  | ✅  |     |
-| 8.0              | ✅  | ✅  | ✅  | (2) |
-| 8.1              | ✅  | ✅  | ✅  | (2) |
-| main branch      | ✅  | ✅  | ✅  | (2) |
+| ↓ Rails / Ruby → | 3.2 | 3.3 | 3.4 | 4.0 | Notes   |
+|-----------------:|:----|:----|:----|:----|:--------|
+| 7.0              | ✅  | ❌  | ❌  | ❌  | (1) |
+| 7.1              | ✅  | ❌  | ❌  | ❌  | (1) |
+| 7.2              | ✅  | ✅  | ✅  | ✅  |     |
+| 8.0              | ✅  | ✅  | ✅  | ✅  | (2) |
+| 8.1              | ✅  | ✅  | ✅  | ✅  | (2) |
+| main branch      | ✅  | ✅  | ✅  | ✅  | (2) |
 
 <details open><summary>Notes</summary>