Remove varnish module as not used anymore #4

Job	Run time
fmt	7s
validate (envs/production)	12s
validate (envs/staging)	14s
validate (modules/api)	11s
validate (modules/cloudflare)	15s
validate (modules/dbdump)	10s
validate (modules/dbsetup)	11s
validate (modules/dbsetup)	16s
validate (modules/enmeshed)	8s
validate (modules/gcloud/cluster)	9s
validate (modules/gcloud/gcloud_dbdump_reader)	9s
validate (modules/gcloud/gcloud_dbdump_writer)	8s
validate (modules/gcloud/gcloud_mysql)	13s
validate (modules/gcloud/gcloud_postgres)	10s
validate (modules/hydra)	10s
validate (modules/ingress)	8s
validate (modules/ingress-nginx)	9s
validate (modules/kratos)	8s
validate (modules/mysql)	15s
validate (modules/notification-mail)	13s
validate (modules/postgres)	16s
validate (modules/redis)	11s
validate (modules/rocket-chat)	13s
validate (modules/tls-self-signed-cert)	8s
	4m 24s

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