Run tests against the main branch of Ruff

.github/workflows/ci.yaml

@@ -1,5 +1,8 @@
 name: CI
 
+env:
+  RUFF_UNRELEASED_REF: 'main'
+
 on:
   push:
     branches: [main]
@@ -45,29 +48,33 @@ jobs:
           )
           # Get the oldest supported version from the pyproject.toml
           OLDEST=$(rg -No '"ruff>=(.*)"' -r '$1' pyproject.toml)
+          UNRELEASED=${{ env.RUFF_UNRELEASED_REF }}
 
-          echo "::set-output name=versions::[\"$OLDEST\", \"$LATEST\"]"
-          echo "::set-output name=oldest::$OLDEST
-          echo "::set-output name=latest::$LATEST
+          echo "::set-output name=latest::$LATEST"
+          echo "::set-output name=oldest::$OLDEST"
+          echo "::set-output name=dev::$UNRELEASED"
     outputs:
-      versions: ${{ steps.set-versions.outputs.versions }}
-      oldest: ${{ steps.set-versions.outputs.oldest }}
       latest: ${{ steps.set-versions.outputs.latest }}
+      oldest: ${{ steps.set-versions.outputs.oldest }}
+      dev: ${{ steps.set-versions.outputs.dev }}
+
   test:
     name: Test (python-${{ matrix.python-version }}, ruff-${{ matrix.ruff-version }}, ${{ matrix.os }})
     needs: ruff-versions
     strategy:
       fail-fast: false
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-        ruff-version: ${{ fromJson(needs.ruff-versions.outputs.versions) }}
         os: [ubuntu-latest, macos-latest, windows-latest]
 
-        exclude:
-          - os: windows-latest
-            ruff-version: ${{ needs.ruff-versions.outputs.oldest }}
-          - os: macos-latest
-            ruff-version: ${{ needs.ruff-versions.outputs.oldest }}
+        include:
+          - ruff-version: ${{ needs.ruff-versions.outputs.latest }}
+          - ruff-version: ${{ needs.ruff-versions.outputs.oldest }}
+            os: ubuntu-latest
+            python-version: "3.7"
+          - ruff-version: ${{ needs.ruff-versions.outputs.dev }}
+            os: ubuntu-latest
+            python-version: "3.12"
 
     runs-on: ${{ matrix.os }}
     steps:
@@ -79,9 +86,24 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           cache: 'pip'
+
       - name: Install dependencies
-        run: just install
-      - name: Install test Ruff version
-        run: pip install ruff==${{ matrix.ruff-version }}
+        run: |
+          pip install -U pip
+          just install
+
+      - name: Install test Ruff version from PyPI
+        if: ${{ matrix.ruff-version != env.RUFF_UNRELEASED_REF }} 
+        run: |
+          pip install ruff==${{ matrix.ruff-version }}
+          ruff --version
+
+      - name: "Install test Ruff version from GitHub"
+        if: ${{ matrix.ruff-version == env.RUFF_UNRELEASED_REF }}
+        run: |
+          pip install --force-reinstall git+https://github.com/astral-sh/ruff@${{ matrix.ruff-version }}
+          pip show ruff
+          ruff version
+
       - name: Run tests
         run: just test