the dbus is in ro it is ok.
Did you give to the user executing the command the or the group of the user the right to read/write and execute?
As you docker is spinning up, I suppose, you have the non root user in a docker group but then I believe you need to specify the PUID and PUIG in order to make HA work fine.
See this: Improving Docker security - non-root configuration - #8 by thi_baut
If it is a security concern, you need to pay attention to host network as well.
hope it helps.