/internal/storage/dolt: fix windows build issue

internal/storage/dolt/process_unix.go

@@ -0,0 +1,32 @@
+//go:build !windows
+// +build !windows
+
+package dolt
+
+import (
+	"os"
+	"strings"
+	"syscall"
+)
+
+func processMayBeAlive(p *os.Process) bool {
+	// Signal 0 checks for existence without sending a real signal.
+	if err := p.Signal(syscall.Signal(0)); err != nil {
+		return false
+	}
+	return true
+}
+
+func terminateProcess(p *os.Process) error {
+	if p == nil {
+		return nil
+	}
+	if err := p.Signal(syscall.SIGTERM); err != nil {
+		// Process may already be dead; treat as success.
+		if strings.Contains(err.Error(), "process already finished") {
+			return nil
+		}
+		return err
+	}
+	return nil
+}