Install uv in CI using a GitHub Action

The Action has a couple of advantages over pipx:

- It verifies the checksum of the downloaded binary
- It caches the installed uv
- It caches UV's own package cache

.github/workflows/ci.yml

@@ -219,12 +219,16 @@ jobs:
         working-directory: cpp
         run: ctest --test-dir build --build-config ${{ env.CMAKE_CONFIG }} --output-on-failure --parallel
 
+      - name: Install uv
+        uses: astral-sh/setup-uv@eb1897b8dc4b5d5bfe39a428a8f2304605e0983c # v7.0.0
+        with:
+          version: "0.8.20"
+
       - name: Install packages for building docs (Linux)
         working-directory: docs
         run: |
           sudo apt-get update
           sudo apt-get install -y --no-upgrade doxygen
-          pipx install uv
           uv sync --locked
         if: runner.os == 'Linux'
 
@@ -243,7 +247,6 @@ jobs:
 
           echo "${{ github.workspace }}\doxygen-1.13.2.windows.x64.bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
 
-          pipx install uv
           uv sync --locked
         if: runner.os == 'Windows'
 

.github/workflows/release.yml

@@ -81,6 +81,11 @@ jobs:
         with:
           python-version: '3.13'
 
+      - name: Install uv
+        uses: astral-sh/setup-uv@eb1897b8dc4b5d5bfe39a428a8f2304605e0983c # v7.0.0
+        with:
+          version: "0.8.20"
+
       - name: Install packages for building docs
         working-directory: docs
         run: |
@@ -96,7 +101,6 @@ jobs:
 
           echo "${{ github.workspace }}\doxygen-1.13.2.windows.x64.bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
 
-          pipx install uv
           uv sync --locked
 
       - name: Build docs