fixed ci, release, docs

.github/workflows/ci.yml

@@ -34,6 +34,12 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y libmpv-dev
 
+      # Without this the test binaries do not link: there is no mpv.lib on the
+      # runner. See .github/actions/libmpv-windows.
+      - name: Install libmpv (Windows)
+        if: runner.os == 'Windows'
+        uses: ./.github/actions/libmpv-windows
+
       - run: cargo fmt --all -- --check
 
       - run: cargo clippy --workspace --all-targets -- -D warnings