docs(storage): add runtime storage configuration examples (#1456)

docs/content/1.guide/4.storage.md

@@ -58,6 +58,59 @@ export default defineNuxtConfig({
 ```
 ::
 
+
+### Runtime configuration
+
+In scenarios where the mount point configuration is not known until runtime, Nitro can dynamically add mount points during startup using [plugins](/guide/plugins):
+
+::alert{type="info"}
+This is a temporary workaround, with a better solution coming in the future! Keep a lookout on the GitHub issue [here](https://github.com/unjs/nitro/issues/1161#issuecomment-1511444675).
+::
+
+::code-group
+```ts [plugins/storage.ts]
+import redisDriver from 'unstorage/drivers/redis'
+
+export default defineNitroPlugin(() => {
+  const storage = useStorage()
+
+  // Dynamically pass in credentials from runtime configuration, or other sources
+  const driver = redisDriver({
+      base: 'redis',
+      host: useRuntimeConfig().redis.host,
+      port: useRuntimeConfig().redis.port,
+      /* other redis connector options */
+    })
+
+  // Mount driver
+  storage.mount('redis', driver)
+})
+```
+``` ts [nitro.config.ts]
+export default defineNitroConfig({
+  runtimeConfig: {
+    redis: { // Default values
+      host: '',
+      port: 0,
+      /* other redis connector options */
+    }
+  }
+})
+```
+``` ts [nuxt.config.ts]
+export default defineNuxtConfig({
+  runtimeConfig: {
+    redis: { // Default values
+      host: '',
+      port: 0,
+      /* other redis connector options */
+    }
+  }
+})
+```
+::
+
+
 Usage:
 
 ```js