disable cache at build time.

using build tag `nocache` to disable usage of the disk cache entirely.

null_cache.go

@@ -0,0 +1,19 @@
+//go:build nocache
+
+package main
+
+import (
+	"time"
+)
+
+var cache = Cache{}
+
+type Cache struct{}
+
+func (c *Cache) initialize() func()                                      { return func() {} }
+func (c *Cache) Get(key string) ([]byte, bool)                           { return nil, false }
+func (c *Cache) GetJSON(key string, recv any) bool                       { return false }
+func (c *Cache) Set(key string, value []byte)                            {}
+func (c *Cache) SetJSON(key string, value any)                           {}
+func (c *Cache) SetWithTTL(key string, value []byte, ttl time.Duration)  {}
+func (c *Cache) SetJSONWithTTL(key string, value any, ttl time.Duration) {}