ci: move linting to separate yml file

and simplify the action, doesn't require installing the entire package.

.github/workflows/build.yml

@@ -44,33 +44,6 @@ jobs:
             pytest -v ;
             python${{ matrix.python-version }} -m build'
 
-  lint:
-    if: github.event.pull_request.draft == false
-    name: Linting build
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: ["ubuntu-latest"]
-        python-version: ["3.10"]
-    steps:
-      - uses: actions/checkout@v3
-      - name: Set up Python 3.10
-        uses: actions/setup-python@v3
-        with:
-          python-version: ${{ matrix.python-version }}
-      - name: Python info
-        shell: bash -l {0}
-        run: |
-          which python3
-          python3 --version
-      - name: Upgrade pip and install dependencies
-        run: |
-          python3 -m pip install --upgrade pip setuptools
-          python3 -m pip install .[dev,publishing]
-      - name: Check linting with ruff
-        run: ruff check .
-
   coveralls:
     if: github.event.pull_request.draft == false
     name: Coveralls build

.github/workflows/lint.yml

@@ -0,0 +1,41 @@
+name: Linting
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+    paths-ignore:
+      - "**.md"
+      - "**.rst"
+      - "**.ipynb"
+    branches:
+      - main
+
+jobs:
+  lint:
+    if: github.event.pull_request.draft == false
+    name: Linting
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest"]
+        python-version: ["3.10"]
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Python info
+        shell: bash -l {0}
+        run: |
+          which python3
+          python3 --version
+      - name: Check linting and formatting using ruff
+        run: |
+          python3 -m pip install ruff
+          ruff check || echo "Please ensure you have the latest version of ruff (`ruff -V`) installed locally."
+          ruff format --check || echo "Please ensure you have the latest version of ruff (`ruff -V`) installed locally."