Add yaml server config, restart server when ConfigMap changes

internal/util/exec/exec.go

@@ -0,0 +1,30 @@
+package exec
+
+import (
+	"context"
+	"os/exec"
+)
+
+type Cmd struct {
+	*exec.Cmd
+}
+
+func (cmd *Cmd) Restart(ctx context.Context) error {
+	if cmd.Process != nil {
+		if err := cmd.Process.Kill(); err != nil {
+			return err
+		}
+	}
+	newCmd := exec.CommandContext(ctx, cmd.Args[0], cmd.Args[1:]...)
+	newCmd.Dir = cmd.Dir
+	newCmd.Env = cmd.Env
+	newCmd.Stdin = cmd.Stdin
+	newCmd.Stdout = cmd.Stdout
+	newCmd.Stderr = cmd.Stderr
+	cmd.Cmd = newCmd
+	return cmd.Start()
+}
+
+func CommandContext(ctx context.Context, name string, args ...string) *Cmd {
+	return &Cmd{Cmd: exec.CommandContext(ctx, name, args...)}
+}