ci: optimize workflow with caching and concurrency

.github/workflows/ci.yml

@@ -2,9 +2,13 @@ name: CI
 
 on:
   push:
-    branches: [ main ]
+    branches: [main]
   pull_request:
-    branches: [ main ]
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 permissions:
   contents: read
@@ -17,67 +21,63 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
-
         include:
           - os: ubuntu-latest
             python-version: "3.13"
             coverage: true
 
     steps:
-    - name: Harden the runner (Audit all outbound calls)
-      uses: step-security/harden-runner@ec9f2d5744a09debf3a187a3f4f675c53b671911 # v2.13.0
-      with:
-        egress-policy: audit
-
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@ec9f2d5744a09debf3a187a3f4f675c53b671911 # v2.13.0
+        with:
+          egress-policy: audit
 
-    - name: Set up Python
-      uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
-      with:
-        python-version: ${{ matrix.python-version }}
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
-    - name: Locate pip cache
-      id: pip-cache
-      shell: bash
-      run: echo "dir=$(python -m pip cache dir)" >> "$GITHUB_OUTPUT"
+      - name: Set up Python
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
 
-    - name: Cache pip
-      uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
-      with:
-        path: ${{ steps.pip-cache.outputs.dir }}
-        key: ${{ runner.os }}-pip-${{ hashFiles('pyproject.toml') }}
-        restore-keys: ${{ runner.os }}-pip-
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install ".[dev,server]"
 
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        python -m pip install ".[dev,server]"
+      - name: Cache pytest results
+        uses: actions/cache@v4
+        with:
+          path: .pytest_cache
+          key: ${{ runner.os }}-pytest-${{ matrix.python-version }}-${{ hashFiles('**/pytest.ini') }}
+          restore-keys: |
+            ${{ runner.os }}-pytest-${{ matrix.python-version }}-
 
-    - name: Run tests
-      if: ${{ matrix.coverage != true }}
-      run: pytest
+      - name: Run tests
+        if: ${{ matrix.coverage != true }}
+        run: pytest
 
-    - name: Run tests and collect coverage
-      if: ${{ matrix.coverage == true }}
-      run: |
-        pytest \
-        --cov=gitingest \
-        --cov=server \
-        --cov-branch \
-        --cov-report=xml \
-        --cov-report=term
+      - name: Run tests and collect coverage
+        if: ${{ matrix.coverage == true }}
+        run: |
+          pytest \
+          --cov=gitingest \
+          --cov=server \
+          --cov-branch \
+          --cov-report=xml \
+          --cov-report=term
 
-    - name: Upload coverage to Codecov
-      if: ${{ matrix.coverage == true }}
-      uses: codecov/codecov-action@18283e04ce6e62d37312384ff67231eb8fd56d24 # v5.4.3
-      with:
-        token: ${{ secrets.CODECOV_TOKEN }}
-        files: coverage.xml
-        flags: ${{ matrix.os }}-py${{ matrix.python-version }}
-        name: codecov-${{ matrix.os }}-${{ matrix.python-version }}
-        fail_ci_if_error: true
-        verbose: true
+      - name: Upload coverage to Codecov
+        if: ${{ matrix.coverage == true }}
+        uses: codecov/codecov-action@18283e04ce6e62d37312384ff67231eb8fd56d24 # v5.4.3
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: coverage.xml
+          flags: ${{ matrix.os }}-py${{ matrix.python-version }}
+          name: codecov-${{ matrix.os }}-${{ matrix.python-version }}
+          fail_ci_if_error: true
+          verbose: true
 
-    - name: Run pre-commit hooks
-      uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1
-      if: ${{ matrix.python-version == '3.13' && matrix.os == 'ubuntu-latest' }}
+      - name: Run pre-commit hooks
+        uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1
+        if: ${{ matrix.python-version == '3.13' && matrix.os == 'ubuntu-latest' }}