fix: explicitly set the dump's content type (#3302)

Author: farnabaz

Diff for: src/runtime/presets/cloudflare-pages/database-handler.ts

@@ -1,8 +1,9 @@
-import { eventHandler, getRouterParam } from 'h3'
+import { eventHandler, getRouterParam, setHeader } from 'h3'
 import { useStorage } from 'nitropack/runtime'
 
 export default eventHandler(async (event) => {
   const collection = getRouterParam(event, 'collection')!
+  setHeader(event, 'Content-Type', 'text/plain')
 
   const ASSETS = event?.context?.cloudflare?.env.ASSETS || process.env.ASSETS
   if (ASSETS) {

Diff for: src/runtime/presets/node/database-handler.ts

@@ -1,8 +1,9 @@
-import { eventHandler, getRouterParam } from 'h3'
+import { eventHandler, getRouterParam, setHeader } from 'h3'
 import { useStorage } from 'nitropack/runtime'
 
 export default eventHandler(async (event) => {
   const collection = getRouterParam(event, 'collection')!
+  setHeader(event, 'Content-Type', 'text/plain')
 
   const data = await useStorage().getItem(`build:content:database.compressed.mjs`) || ''
   if (data) {