Add a linting workflow

Author: AA-Turner

.github/workflows/ci.yml

@@ -16,27 +16,6 @@ env:
   FORCE_COLOR: "1"
 
 jobs:
-  # We only need to lint once, not for _each_ python version
-  lint:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: "3"
-      - name: Install pip
-        run: python -m pip install --upgrade pip
-
-      - name: Install pre-commit
-        run: pip install pre-commit
-
-      - name: Lint
-        run: |
-          pre-commit run --all-files -v --show-diff-on-failure
-          pre-commit gc
-
   test:
     runs-on: ubuntu-latest
 

.github/workflows/lint.yml

@@ -0,0 +1,72 @@
+name: Lint source code
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+env:
+  FORCE_COLOR: "1"
+
+jobs:
+  ruff:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3"
+    - name: Install pip
+      run: python -m pip install --upgrade pip
+
+    - name: Install Ruff
+      run: python -m pip install "ruff==0.5.2"
+
+    - name: Lint with Ruff
+      run: ruff check . --output-format github
+
+    - name: Format with Ruff
+      run: ruff format . --diff
+
+  mypy:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3"
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install ".[lint,test]"
+    - name: Type check with mypy
+      run: mypy
+
+  twine:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3"
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install --upgrade twine build
+    - name: Lint with twine
+      run: |
+        python -m build .
+        twine check dist/*