Found
Apparently this is an issue related to Lets Encrypt Root CA expiry. I don't know if it comes from the server or my system, but I partly followed this method to remove the mean "mozilla/DST_Root_CA_X3.crt" certificate from my system.

Hi,

The certificate of "releases.domoticz.com" seems out again. At least I did not find any solution for this error on the forum.

Command issued on the Orange Pi:
curl -sSL install.domoticz.com | sudo bash
Error code :
...
Resolving www.domoticz.com (www.domoticz.com)... 188.114.96.20, 188 ...