chore: trim spaces for x-caddy, diff Caddy configs when comparing service specs

pkg/api/caddy.go

@@ -1,8 +1,21 @@
 package api
 
+import "strings"
+
 // CaddySpec is the Caddy reverse proxy configuration for a service.
 type CaddySpec struct {
 	// Config contains the Caddy config (Caddyfile) content. It must not conflict with the Caddy configs
 	// of other services.
 	Config string
 }
+
+func (c *CaddySpec) Equals(other *CaddySpec) bool {
+	if c == nil {
+		return other == nil || strings.TrimSpace(other.Config) == ""
+	}
+	if other == nil {
+		return strings.TrimSpace(c.Config) == ""
+	}
+
+	return strings.TrimSpace(c.Config) == strings.TrimSpace(other.Config)
+}