feat(config): allow app to run in a subfolder via BASE_URL (#461)

* fix: allow hosting in subfolder via BASE_URL

* Import baseUrl from config

* Revert "Import baseUrl from config"

This reverts commit 73c867ebc8.

* feat(config): fallback baseUrl to /

* feat(config): fallback baseUrl to /

---------

Co-authored-by: Corentin Thomasset <corentin.thomasset74@gmail.com>

vite.config.ts

@@ -16,6 +16,8 @@ import Icons from 'unplugin-icons/vite';
 import IconsResolver from 'unplugin-icons/resolver';
 import VueI18n from '@intlify/unplugin-vue-i18n/vite';
 
+const baseUrl = process.env.BASE_URL ?? '/';
+
 // https://vitejs.dev/config/
 export default defineConfig({
   plugins: [
@@ -55,7 +57,7 @@ export default defineConfig({
         description: 'Aggregated set of useful tools for developers.',
         display: 'standalone',
         lang: 'fr-FR',
-        start_url: '/?utm_source=pwa&utm_medium=pwa',
+        start_url: `${baseUrl}?utm_source=pwa&utm_medium=pwa`,
         orientation: 'any',
         theme_color: '#18a058',
         background_color: '#f1f5f9',
@@ -92,6 +94,7 @@ export default defineConfig({
     }),
     Unocss(),
   ],
+  base: baseUrl,
   resolve: {
     alias: {
       '@': fileURLToPath(new URL('./src', import.meta.url)),