This fixes an error during container startup due to interpolating a
$STORAGE value that may contain slashes or other "active" characters:
...
Using secure websockets: false
Using storage adapter: ./storage/file
sed: bad option in substitution expression
Also add a trailing ',' in the search expression to avoid substituting
in the comment above the actual definition:
/* If Cryptpad is proxied without using https, the server needs to know.
* Specify 'useSecureWebsockets: true' so that it can send
...
