improve GH Action: test w/ faraday 1.x & 2.x on various ruby's

- run tests w/ the generated gemfiles so when a ruby version fails it's shown as a separate failure in GHA

Author: LeipeLeon

.github/workflows/ruby.yml

@@ -17,8 +17,9 @@ permissions:
   contents: read
 
 jobs:
-  test:
-    runs-on: ubuntu-22.04
+  test_ruby_version:
+    runs-on: ubuntu-latest
+    name: ruby-${{ matrix.ruby }}, ${{ matrix.gemfile }}
     strategy:
       fail-fast: false
       matrix:
@@ -27,13 +28,36 @@ jobs:
           - "3.1"
           - "3.2"
           - "3.3"
+          - "3.4"
+        gemfile:
+          - "faraday_1.x"
+          - "faraday_2.x"
+    env:
+      BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}.gemfile
     steps:
     - uses: actions/checkout@v4
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Configure bundler
+      run: |
+        bundle config path vendor/bundle
+    - name: Create bundler lockfile
+      run: |
+        bundle lock
+    - uses: actions/cache@v3
+      with:
+        # NOTE: Bundler expands the path relative to the gemfile, not the
+        # current directory.
+        path: ./gemfiles/vendor/bundle
+        key: bundled-gems-${{ runner.os }}-ruby-${{ matrix.ruby }}-${{ matrix.gemfile }}-${{ hashFiles( 'gemfiles/*.lock' ) }}
+        restore-keys: |
+          bundled-gems-${{ runner.os }}-ruby-${{ matrix.ruby }}-${{ matrix.gemfile }}-
+          bundled-gems-${{ runner.os }}-ruby-${{ matrix.ruby }}-
+    - name: Install gems
+      run: |
+        bundle install --jobs 4
     - name: Run tests
       run: bundle exec rake
-