ci: package windows agent as WiX MSI

.gitea/workflows/agent-release.yml

@@ -53,3 +53,49 @@ jobs:
                       agent/dist/vantage-agent-linux-arm64
                       agent/dist/vantage-agent-windows-amd64.exe
                       agent/dist/checksums.txt
+
+    msi:
+        needs: build
+        runs-on: ubuntu-docker
+        container: mcr.microsoft.com/dotnet/sdk:9.0
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+
+            - name: Set up Go
+              uses: actions/setup-go@v5
+              with:
+                  go-version: "1.26"
+                  cache: true
+                  cache-dependency-path: agent/go.sum
+
+            - name: Build agent exe
+              working-directory: agent
+              run: |
+                  GOOS=windows GOARCH=amd64 go build \
+                    -o ../installer/vantage-agent-windows-amd64.exe ./cmd
+
+            - name: Fetch nssm
+              working-directory: installer
+              run: |
+                  apt-get update && apt-get install -y unzip curl
+                  curl -fsSL -o nssm.zip https://nssm.cc/release/nssm-2.24.zip
+                  unzip -j nssm.zip 'nssm-2.24/win64/nssm.exe' -d .
+
+            - name: Install WiX
+              run: dotnet tool install --global wix --version 5.*
+
+            - name: Build MSI
+              working-directory: installer
+              run: |
+                  export PATH="$PATH:/root/.dotnet/tools"
+                  wix build vantage-agent.wxs -o vantage-agent.msi
+                  sha256sum vantage-agent.msi > checksums-msi.txt
+
+            - name: Attach MSI to release
+              uses: https://gitea.com/actions/gitea-release-action@v1
+              with:
+                  token: ${{ secrets.RELEASE_TOKEN }}
+                  files: |
+                      installer/vantage-agent.msi
+                      installer/checksums-msi.txt