The commit
c7fb922d6250543ba5462fa7a6ff03cc8f628e94 prohibits
journal-upload to save its state in /var/lib/systemd/journal-upload/state,
thus the daemon fails and outputs the following error message even if
the directory is not read-only file system
```Cannot save state to /var/lib/systemd/journal-upload/state: Read-only file system```
This commit adds the permission the daemon to write the state file.
RestrictNamespaces=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
SystemCallArchitectures=native
+ReadWritePaths=/var/lib/systemd/journal-upload
# If there are many split up journal files we need a lot of fds to
# access them all and combine