fix: missing curl when not CA

[dotconfig404]

Hi,

when container is running with CA service it will try to check if the CA is running via the helper function ca_running inside [90-ca.sh](https://github.com/OpenVoxProject/container-openvoxserver/blob/main/openvoxserver/container-entrypoint.d/90-ca.sh), but it requires curl to do so. So when trying to build a container that does not have the CA service enabled it will fail.

Example output:

openvox  | Running /container-entrypoint.d/90-ca.sh
openvox  | turning off CA
openvox  | /container-entrypoint.d/90-ca.sh: line 6: curl: command not found
openvox  | /container-entrypoint.d/90-ca.sh: line 6: curl: command not found
openvox  | /container-entrypoint.d/90-ca.sh: line 6: curl: command not found