feat: injects public environment variables in runtime

docs/content/1.get-started/2.configuration.md

@@ -282,3 +282,27 @@ Generates:
 ```
 
 Both usage and output are simplified!
+
+## `Runtime Variables`
+
+You can update all the above options at runtime by adding your configs as `runtimeConfig.public.ipx` key in `nuxt.config.ts`.
+This plugin will merge your injected variables with the module options.
+
+```ts [nuxt.config.ts]
+export default defineNuxtConfig({
+  // ...
+  runtimeConfig: {
+    // ...
+    public: {
+      // ...
+      ipx: {
+        // All the above properties can be added here.
+        alias: process.env.NUXT_PUBLIC_IPX_ALIAS,
+        http: {
+          domains: process.env.NUXT_PUBLIC_IPX_HTTP_DOMAINS,
+        },
+      },
+    },
+  },
+})
+```

src/runtime/ipx.ts

@@ -5,11 +5,16 @@ import type { IPXOptions } from 'ipx'
 import { lazyEventHandler, useBase } from 'h3'
 import { isAbsolute } from 'pathe'
 import type { NitroRuntimeConfig } from 'nitropack'
+import { defu } from 'defu'
 
 import { useRuntimeConfig } from '#imports'
 
 export default lazyEventHandler(() => {
-  const opts = useRuntimeConfig().ipx as NitroRuntimeConfig['ipx'] || {} as Record<string, never>
+  let opts = useRuntimeConfig().ipx as NitroRuntimeConfig['ipx'] || {} as Record<string, never>
+  const publicOpts = useRuntimeConfig().public.ipx as NitroRuntimeConfig['ipx'] || {} as Record<string, never>
+
+  // use NUXT_PUBLIC_IPX_* environment variables for updating options in runtime
+  opts = defu(publicOpts, opts)
 
   // TODO: Migrate to unstorage layer
   const fsDir = opts?.fs?.dir ? (Array.isArray(opts.fs.dir) ? opts.fs.dir : [opts.fs.dir]).map(dir => isAbsolute(dir) ? dir : fileURLToPath(new URL(dir, import.meta.url))) : undefined