add sh

modules/server/containers/apps/etherpad.nix

@@ -69,6 +69,7 @@ let
   image = pkgs.dockerTools.streamLayeredImage {
     name = "etherpad";
     tag = etherpad_exe.version;
+    contents = [ pkgs.sh ];
     config = {
       Entrypoint = [ "${etherpad_exe}/bin/etherpad-lite" ];
       ExposedPorts = { "8080/tcp" = {}; };