Fix Windows builds and test they compile

They are still not officially supported but this ensures we don't
break the build accidentally.

Caches are enabled by default in actions/setup-go@v4 so no need to
manually cache.

.github/workflows/commit.yml

@@ -20,7 +20,6 @@ jobs:
       - uses: actions/setup-go@v4
         with:
           go-version: ${{ env.GO_VERSION }}
-          cache: true
 
       - run: |
           go install golang.org/x/tools/cmd/goimports@latest
@@ -29,21 +28,36 @@ jobs:
 
       - uses: pre-commit/[email protected]
 
-  build:
-    name: Build & Unit Test
+  build-windows:
+    name: Build Windows
     runs-on: ubuntu-latest
     steps:
+      - run: sudo apt-get install -y mingw-w64
+
       - uses: actions/checkout@v4
 
       - uses: actions/setup-go@v4
         with:
           go-version: ${{ env.GO_VERSION }}
 
-      - uses: actions/cache@v2
+      - run: |
+          go build ./cmd/litestream/
+          file ./litestream.exe
+        env:
+          CGO_ENABLED: "1"
+          GOOS: windows
+          GOARCH: amd64
+          CC: x86_64-w64-mingw32-gcc
+
+  build:
+    name: Build & Unit Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v4
         with:
-          path: ~/go/pkg/mod
-          key: ${{ inputs.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: ${{ inputs.os }}-go-
+          go-version: ${{ env.GO_VERSION }}
 
       - run: go env
 

cmd/litestream/main_windows.go

@@ -5,7 +5,6 @@ package main
 import (
 	"context"
 	"io"
-	"log"
 	"log/slog"
 	"os"
 	"os/signal"
@@ -37,16 +36,16 @@ func runWindowsService(ctx context.Context) error {
 	defer elog.Close()
 
 	// Set eventlog as log writer while running.
-	log.SetOutput((*eventlogWriter)(elog))
-	defer log.SetOutput(os.Stderr)
+	slog.SetDefault(slog.New(slog.NewTextHandler((*eventlogWriter)(elog), nil)))
+	defer slog.SetDefault(slog.New(slog.NewTextHandler(os.Stderr, nil)))
 
-	log.Print("Litestream service starting")
+	slog.Info("Litestream service starting")
 
 	if err := svc.Run(serviceName, &windowsService{ctx: ctx}); err != nil {
 		return errStop
 	}
 
-	log.Print("Litestream service stopped")
+	slog.Info("Litestream service stopped")
 	return nil
 }
 
@@ -69,7 +68,7 @@ func (s *windowsService) Execute(args []string, r <-chan svc.ChangeRequest, stat
 	}
 
 	// Execute replication command.
-	if err := c.Run(s.ctx); err != nil {
+	if err := c.Run(); err != nil {
 		slog.Error("cannot replicate", "error", err)
 		statusCh <- svc.Status{State: svc.StopPending}
 		return true, 2