Add Windows to CI matrix.

.github/workflows/rust.yml

@@ -43,7 +43,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ['macos-latest', 'ubuntu-22.04']
+        os: ['macos-latest', 'ubuntu-22.04', 'windows-latest']
         rust: ['stable', '1.57']
 
     runs-on: ${{ matrix.os }}
@@ -63,7 +63,25 @@ jobs:
         run: brew install gtk4 pkg-config
         if: matrix.os == 'macos-latest'
 
-      - uses: Swatinem/rust-cache@v2
+      - name: Install dependencies (Windows)
+        uses: lukka/run-vcpkg@v11
+        with:
+          vcpkgGitCommitId: c8696863d371ab7f46e213d8f5ca923c4aef2a00
+          runVcpkgInstall: true
+          doNotCache: false
+        if: matrix.os == 'windows-latest'
+
+      - name: Set PKG_CONFIG (Windows)
+        run: echo ('PKG_CONFIG=' + $env:VCPKG_ROOT + '\installed\x64-windows\tools\pkgconf\pkgconf.exe') >> $env:GITHUB_ENV
+        if: matrix.os == 'windows-latest'
+
+      - name: Set PKG_CONFIG_PATH (Windows)
+        run: echo ('PKG_CONFIG_PATH=' + $env:VCPKG_ROOT + '\installed\x64-windows\lib\pkgconfig') >> $env:GITHUB_ENV
+        if: matrix.os == 'windows-latest'
+
+      - name: Set PATH (Windows)
+        run: echo ('PATH=' + $env:PATH + ';' + $env:VCPKG_ROOT + '\installed\x64-windows\bin') >> $env:GITHUB_ENV
+        if: matrix.os == 'windows-latest'
 
       - name: Build
         uses: actions-rs/cargo@v1

vcpkg.json

@@ -0,0 +1,3 @@
+{
+  "dependencies": ["gtk", "pkgconf"]
+}