The solution for the official Duplicati Docker image is the same as posted above for Debian. You want to remove this file from within the container:
/usr/share/ca-certificates/mozilla/DST_Root_CA_X3.crt
The solution for the official Duplicati Docker image is the same as posted above for Debian. You want to remove this file from within the container:
/usr/share/ca-certificates/mozilla/DST_Root_CA_X3.crt