[full-ci] Introduce TLS Settings for go-micro based grpc services and clients (#4901)

* Introduce TLS Settings for go-micro based grpc services and clients

TLS for the services can be configure by setting the OCIS_MICRO_GRPC_TLS_ENABLED"
"OCIS_MICRO_GRPC_TLS_CERTIFICATE" and "OCIS_MICRO_GRPC_TLS_KEY"
enviroment variables.

TLS for the clients can configured by setting the "OCIS_MICRO_GRPC_CLIENT_TLS_MODE"
and "OCIS_MICRO_GRPC_CLIENT_TLS_CACERT" variables.

By default TLS is disabled.

Co-authored-by: Martin <github@diemattels.at>

* Unify TLS configuration for all grpc services

All grpc service (whether they're based on reva) or go-micro use the
same set of config vars now.

TLS for the services can be configure by setting the OCIS_GRPC_TLS_ENABLED,
OCIS_GRPC_TLS_CERTIFICATE and OCIS_GRPC_TLS_KEY enviroment variables.

TLS for the clients can configured by setting the OCIS_GRPC_CLIENT_TLS_MODE
and OCIS_MICRO_GRPC_CLIENT_TLS_CACERT variables.

There are no individual per service config vars currently. If really
needed, per service tls configurations can be specified via config file.

Co-authored-by: Martin <github@diemattels.at>

Co-authored-by: Martin <github@diemattels.at>

services/store/pkg/server/grpc/server.go

@@ -11,7 +11,12 @@ import (
 func Server(opts ...Option) grpc.Service {
 	options := newOptions(opts...)
 
-	service := grpc.NewService(
+	service, err := grpc.NewService(
+		grpc.TLSEnabled(options.Config.GRPC.TLS.Enabled),
+		grpc.TLSCert(
+			options.Config.GRPC.TLS.Cert,
+			options.Config.GRPC.TLS.Key,
+		),
 		grpc.Namespace(options.Config.GRPC.Namespace),
 		grpc.Name(options.Config.Service.Name),
 		grpc.Version(version.GetString()),
@@ -20,6 +25,10 @@ func Server(opts ...Option) grpc.Service {
 		grpc.Logger(options.Logger),
 		grpc.Flags(options.Flags...),
 	)
+	if err != nil {
+		options.Logger.Fatal().Err(err).Msg("Error creating store service")
+		return grpc.Service{}
+	}
 
 	hdlr, err := svc.New(
 		svc.Logger(options.Logger),