chore: share gh actions setup across jobs

Author: damassi

.github/actions/setup/action.yml

@@ -0,0 +1,22 @@
+name: Setup Python and Dependencies
+description: Checkout code, install uv, and sync dependencies
+
+runs:
+  using: composite
+  steps:
+    - uses: actions/checkout@v4
+
+    - name: Install uv
+      uses: astral-sh/setup-uv@v4
+      with:
+        enable-cache: true
+
+    - name: Cache virtual environment
+      uses: actions/cache@v4
+      with:
+        path: .venv
+        key: venv-${{ runner.os }}-${{ hashFiles('uv.lock') }}
+
+    - name: Install dependencies
+      shell: bash
+      run: uv sync --all-groups

.github/workflows/ci.yml

@@ -10,41 +10,23 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@v4
-
-      - name: Install dependencies
-        run: uv sync --all-groups
+      - uses: ./.github/actions/setup
 
       - name: Run linter
         run: uv run ruff check src tests
 
   typecheck:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@v4
-
-      - name: Install dependencies
-        run: uv sync --all-groups
+      - uses: ./.github/actions/setup
 
       - name: Run type checker
         run: uv run ty check src
 
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@v4
-
-      - name: Install dependencies
-        run: uv sync --all-groups
+      - uses: ./.github/actions/setup
 
       - name: Run tests
         run: uv run pytest