Add optional caching to setup-uv (#822)

.github/workflows/ci.yml

@@ -25,6 +25,8 @@ jobs:
         with:
           python-version: "3.14"
           activate-environment: true
+          enable-cache: true
+          cache-dependency-glob: "pyproject.toml"
       - run: |
           uv --version
           python -c "import os, sys; assert sys.version_info[:2] == (3, 14); assert os.environ['VIRTUAL_ENV'].endswith(r'\.venv')"
@@ -44,6 +46,8 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           activate-environment: true
+          enable-cache: true
+          cache-dependency-glob: "pyproject.toml"
 
       - name: Install dependencies
         run: |

actions/__init__.py

@@ -28,4 +28,4 @@
 #     ├── test_summarize_pr.py
 #     └── ...
 
-__version__ = "0.2.28"
+__version__ = "0.2.29"

setup-uv/README.md

@@ -9,11 +9,15 @@ Installs the latest [uv](https://docs.astral.sh/uv/) release with retry support
   with:
     python-version: "3.14"
     activate-environment: true
+    enable-cache: true
+    cache-dependency-glob: "pyproject.toml"
 ```
 
 ## Inputs
 
-| Input                  | Description                               | Required | Default |
-| ---------------------- | ----------------------------------------- | -------- | ------- |
-| `python-version`       | Python version for uv commands            | No       | -       |
-| `activate-environment` | Create and activate a `.venv` environment | No       | `false` |
+| Input                   | Description                               | Required | Default      |
+| ----------------------- | ----------------------------------------- | -------- | ------------ |
+| `python-version`        | Python version for uv commands            | No       | -            |
+| `activate-environment`  | Create and activate a `.venv` environment | No       | `false`      |
+| `enable-cache`          | Cache uv downloads between workflow runs  | No       | `false`      |
+| `cache-dependency-glob` | Dependency files used to invalidate cache | No       | `**/uv.lock` |

setup-uv/action.yml

@@ -11,6 +11,14 @@ inputs:
     description: "Create and activate a .venv environment"
     required: false
     default: "false"
+  enable-cache:
+    description: "Cache uv downloads between workflow runs"
+    required: false
+    default: "false"
+  cache-dependency-glob:
+    description: "Dependency files used to invalidate the uv cache"
+    required: false
+    default: "**/uv.lock"
 
 runs:
   using: "composite"
@@ -49,3 +57,17 @@ runs:
             echo "$PWD/.venv/bin" >> "$GITHUB_PATH"
           fi
         fi
+
+    - name: Find uv cache
+      if: inputs.enable-cache == 'true'
+      id: uv-cache
+      shell: bash
+      run: echo "path=$(uv cache dir)" >> "$GITHUB_OUTPUT"
+
+    - name: Cache uv
+      if: inputs.enable-cache == 'true'
+      uses: actions/cache@v6
+      with:
+        path: ${{ steps.uv-cache.outputs.path }}
+        key: uv-${{ runner.os }}-${{ runner.arch }}-${{ inputs.python-version }}-${{ hashFiles(inputs.cache-dependency-glob) }}
+        restore-keys: uv-${{ runner.os }}-${{ runner.arch }}-${{ inputs.python-version }}-