Let's try this

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+---
+name: CI
+
+on:
+  push:
+      branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+env:
+  FORCE_COLOR: "1" # Make tools pretty.
+
+jobs:
+  check-install:
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v4
+          with:
+            path: action
+
+        - uses: ./action
+
+        - run: uv --version

.pre-commit-config.yaml

@@ -0,0 +1,11 @@
+---
+ci:
+  autoupdate_schedule: monthly
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml

action.yml

@@ -0,0 +1,26 @@
+---
+name: Setup uv and handle its cache
+description: Downloads and installs the Python uv packaging manager and handles its cache.
+author: Hynek Schlawack
+branding:
+  icon: package
+  color: purple
+
+
+runs:
+  using: composite
+
+  steps:
+  - name: Install uv
+    run: curl -LsSf https://astral.sh/uv/install.sh | sh
+    shell: bash
+
+  - name: Find uv cache
+    run: echo "UV_CACHE=$(uv cache dir)" >>$GITHUB_ENV
+    shell: bash
+
+  - name: Load uv cache
+    uses: actions/cache@v4
+    with:
+      path: ${{ env.UV_CACHE }}
+      key: ${{ runner.os }}-uv