at the end of the day, it was inevitable

frontend/app/static/.htaccess

@@ -0,0 +1,37 @@
+DirectoryIndex index.html
+
+<IfModule mod_rewrite.c>
+    RewriteEngine On
+
+    # Determine the RewriteBase automatically and set it as environment variable.
+    # If you are using Apache aliases to do mass virtual hosting or installed the
+    # project in a subdirectory, the base path will be prepended to allow proper
+    # resolution of the app.php file and to redirect to the correct URI. It will
+    # work in environments without path prefix as well, providing a safe, one-size
+    # fits all solution. But as you do not need it in this case, you can comment
+    # the following 2 lines to eliminate the overhead.
+    RewriteCond %{REQUEST_URI}::$1 ^(/.+)/(.*)::\2$
+    RewriteRule ^(.*) - [E=BASE:%1]
+
+    # Redirect to URI without front controller to prevent duplicate content
+    # (with and without `/app.php`). Only do this redirect on the initial
+    # rewrite by Apache and not on subsequent cycles. Otherwise we would get an
+    # endless redirect loop (request -> rewrite to front controller ->
+    # redirect -> request -> ...).
+    # So in case you get a "too many redirects" error or you always get redirected
+    # to the start page because your Apache does not expose the REDIRECT_STATUS
+    # environment variable, you have 2 choices:
+    # - disable this feature by commenting the following 2 lines or
+    # - use Apache >= 2.3.9 and replace all L flags by END flags and remove the
+    #   following RewriteCond (best solution)
+    RewriteCond %{ENV:REDIRECT_STATUS} ^$
+    RewriteRule ^index\.html(/(.*)|$) %{ENV:BASE}/$2 [R=301,L]
+
+    # If the requested filename exists, simply serve it.
+    # We only want to let Apache serve files and not directories.
+    RewriteCond %{REQUEST_FILENAME} -f
+    RewriteRule .? - [L]
+
+    # Rewrite all other queries to the front controller.
+    RewriteRule .? %{ENV:BASE}/index.html [L]
+</IfModule>