After wiping all files and re-install of my company certificate, suddenly the command works as expected.
trust anchor --store <my.crt>
And curl to AUR / pamac is happy again.
Thank you very much for help @cscs, the short summary of fix is:
- Delete files you don’t know about from
/etc/ca-certificates/trust-source/*
update-ca-trust
- install only those extra certs you want/need
- profit
Thank you