Create missing index in DB to improve search performance

We need to add the following index in the database

CREATE INDEX tls_certificate_subject_index ON tls_certificate(subject);

I have created it on the ovh3 server and search of certificates in the page https://gazelle.ihe.net/gss/certificate/list.seam is now faster

I do not have the sources of the application on my machine to add the change directyl. Thanks for doing it.