Exclude well known files when trailing slash: true (#19364)

* Exclude well known files when trailing slash: true

* Update manifest test
Co-authored-by: NJJ Kasper <jj@jjsweb.site>

packages/next/lib/load-custom-routes.ts

@@ -388,13 +388,13 @@ export default async function loadCustomRoutes(
   if (config.trailingSlash) {
     redirects.unshift(
       {
-        source: '/:file((?:[^/]+/)*[^/]+\\.\\w+)/',
+        source: '/:file((?!\\.well-known(?:/.*)?)(?:[^/]+/)*[^/]+\\.\\w+)/',
         destination: '/:file',
         permanent: true,
         locale: config.i18n ? false : undefined,
       },
       {
-        source: '/:notfile((?:[^/]+/)*[^/\\.]+)',
+        source: '/:notfile((?!\\.well-known(?:/.*)?)(?:[^/]+/)*[^/\\.]+)',
         destination: '/:notfile/',
         permanent: true,
         locale: config.i18n ? false : undefined,

test/integration/trailing-slashes/test/index.test.js

@@ -291,12 +291,13 @@ describe('Trailing slashes', () => {
         expect.objectContaining({
           redirects: expect.arrayContaining([
             expect.objectContaining({
-              source: '/:file((?:[^/]+/)*[^/]+\\.\\w+)/',
+              source:
+                '/:file((?!\\.well-known(?:/.*)?)(?:[^/]+/)*[^/]+\\.\\w+)/',
               destination: '/:file',
               statusCode: 308,
             }),
             expect.objectContaining({
-              source: '/:notfile((?:[^/]+/)*[^/\\.]+)',
+              source: '/:notfile((?!\\.well-known(?:/.*)?)(?:[^/]+/)*[^/\\.]+)',
               destination: '/:notfile/',
               statusCode: 308,
             }),