CI: Use GitHub Actions for Windows builds

Author: dcommander

.gitattributes

@@ -1,3 +1,2 @@
 /.github export-ignore
-/appveyor.yml export-ignore
 /.gitattributes export-ignore

.github/workflows/build.yml

@@ -90,3 +90,38 @@ jobs:
             ..
           make -j$NUMCPUS --load-average=$NUMCPUS
           popd
+  windows:
+    runs-on: windows-2025
+    steps:
+      - name: Set global environment variables
+        shell: bash
+        run: |
+          echo "BRANCH=${GITHUB_BASE_REF:-${GITHUB_REF#refs/heads/}}" >$GITHUB_ENV
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Set up build
+        shell: bash
+        run: |
+          set -x
+          choco install -y nsis
+          git clone --depth=1 https://github.com/nathan818fr/vcvars-bash.git c:/vcvars-bash
+          git clone --depth=1 https://github.com/VirtualGL/buildscripts.git -b $BRANCH c:/buildscripts
+      - name: Configure GPG signing
+        if: ${{github.event_name != 'pull_request'}}
+        shell: bash
+        run: |
+          printf "${{secrets.GPG_KEY}}" | base64 --decode | gpg --batch --import -
+          echo "GPG_KEY_NAME=\"${{secrets.GPG_KEY_NAME}}\"" >c:/buildscripts/gpgsign
+          echo "GPG_KEY_ID=${{secrets.GPG_KEY_ID}}" >>c:/buildscripts/gpgsign
+          echo "GPG_KEY_PASS=${{secrets.GPG_KEY_PASS}}" >>c:/buildscripts/gpgsign
+      - name: Build
+        shell: bash
+        run: |
+          export PATH="/c/Program Files (x86)/NSIS/:$PATH"
+          export VSINSTALLDIR='C:\Program Files\Microsoft Visual Studio\2022\Enterprise\'
+          eval "$(c:/vcvars-bash/vcvarsall.sh amd64)"
+          echo INCLUDE=$INCLUDE
+          echo LIB=$LIB
+          echo PATH=$PATH
+          c:/buildscripts/buildvgl -d $GITHUB_WORKSPACE -b /c/vgl.nightly -v
+          mv /c/vgl.nightly/log-${{github.job}}.txt /c/vgl.nightly/files/