🔧 Implement Ruff as check instead of Black creating a commit

.github/workflows/format-python.yml

@@ -1,23 +1,57 @@
-name: Format Python
+name: Ensure formatted code
 on:
   pull_request:
     types: [ opened, edited, reopened, synchronize, ready_for_review ]
   workflow_dispatch:
+
+permissions:
+  contents: read
+  pull-requests: write
+
 jobs:
-  format:
+  format_check:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-        with:
-          repository: ${{ github.event.pull_request.head.repo.full_name }}
-          ref: ${{ github.event.pull_request.head.ref }}
-      - name: Format code with black
+      - name: Install ruff
+        run: pip install ruff
+      - name: Check formatting for Python code
+        env:
+          GH_TOKEN: ${{ github.token }}
         run: |
-          pip install black
-          black --line-length 120 .
-      - name: Commit changes
-        uses: EndBug/add-and-commit@v9
-        with:
-          default_author: github_actions
-          message: "Formatted code with black --line-length 120"
-          add: "."
+          set +e
+          format_output=$(ruff format --check)
+          exit_code=$?
+          if [ $exit_code -eq 0 ]; then
+            echo "All Python code is properly formatted."
+            gh pr comment ${{ github.event.pull_request.number }} --body "All Python code is properly formatted."
+          else
+            echo "$format_output" > format_output.txt
+            echo "Some Python code is not properly formatted." >> format_output.txt
+            echo "Please run 'ruff format' to format the code." >> format_output.txt
+            gh pr comment ${{ github.event.pull_request.number }} --body "```$(cat format_output.txt)```"
+            exit 1
+          fi
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install ruff
+        run: pip install ruff
+      - name: Lint Python code
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          set +e
+          check_output=$(ruff check)
+          exit_code=$?
+          if [ $exit_code -eq 0 ]; then
+            echo "All Python code is properly formatted."
+            gh pr comment ${{ github.event.pull_request.number }} --body "No linting errors found."
+          else
+            echo "$check_output" > check_output.txt
+            echo "Some Python code has linting errors." >> check_output.txt
+            echo "Please run 'ruff check --fix' to fix the errors." >> check_output.txt
+            gh pr comment ${{ github.event.pull_request.number }} --body "```$(cat check_output.txt)```"
+            exit 1
+          fi