Kubernetes - deploying custom jks and spi file to container image

I am wanting to use LDAPS for user federation in a KeyCloak container running in Kubernetes.

From the documentation it says that we need to add the jks file to the environment. However I cant seem to figure out how to add the JKS and the corresponding spi extract to the file.

My apologies as I am new to this.
Any help most appreciated.
kind regards,