[ci] Add coverage comment

.github/workflows/main.yml

@@ -5,8 +5,6 @@ name: build
 on:
   - push
   - pull_request
-env:
-  PYTEST_ADDOPTS: --color=yes
 permissions:
   contents: read
 jobs:
@@ -23,7 +21,7 @@ jobs:
       - name: Setup pixi
         uses: prefix-dev/[email protected]
         with:
-          pixi-version: v0.34.0
+          pixi-version: v0.35.0
           cache: true
           auth-host: prefix.dev
           auth-token: ${{ secrets.PREFIX_DEV_TOKEN }}
@@ -47,12 +45,46 @@ jobs:
       - name: Set up Python ${{ matrix.python-version }} & Pixi
         uses: prefix-dev/[email protected]
         with:
-          pixi-version: v0.34.0
+          pixi-version: v0.35.0
           cache: true
           auth-host: prefix.dev
           auth-token: ${{ secrets.PREFIX_DEV_TOKEN }}
       - name: Run tests
         run: pixi run -e test${{ matrix.python-version }} test-ci
+        env:
+          COVERAGE_FILE: .coverage.${{ matrix.python-version }}
+      - name: Store coverage file
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-${{ matrix.python-version }}
+          path: .coverage.${{ matrix.python-version }}
+          include-hidden-files: true
+  coverage:
+    name: Coverage
+    runs-on: ubuntu-latest
+    needs: test
+    permissions:
+      pull-requests: write
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/download-artifact@v4
+        id: download
+        with:
+          pattern: coverage-*
+          merge-multiple: true
+      - name: Coverage comment
+        id: coverage_comment
+        uses: py-cov-action/python-coverage-comment-action@v3
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          MERGE_COVERAGE_FILES: true
+      - name: Store Pull Request comment to be posted
+        uses: actions/upload-artifact@v4
+        if: steps.coverage_comment.outputs.COMMENT_FILE_WRITTEN == 'true'
+        with:
+          name: python-coverage-comment-action
+          path: python-coverage-comment-action.txt
   build:
     name: Build distribution
     runs-on: ubuntu-latest
@@ -66,7 +98,7 @@ jobs:
       - name: Setup pixi
         uses: prefix-dev/[email protected]
         with:
-          pixi-version: v0.34.0
+          pixi-version: v0.35.0
           cache: true
           auth-host: prefix.dev
           auth-token: ${{ secrets.PREFIX_DEV_TOKEN }}