Support SPIFFE mTLS between Traefik and Backend servers

go.mod

@@ -57,6 +57,7 @@ require (
 	github.com/prometheus/client_model v0.2.0
 	github.com/rancher/go-rancher-metadata v0.0.0-20200311180630-7f4c936a06ac
 	github.com/sirupsen/logrus v1.8.1
+	github.com/spiffe/go-spiffe/v2 v2.1.1
 	github.com/stretchr/testify v1.8.0
 	github.com/stvp/go-udp-testing v0.0.0-20191102171040-06b61409b154
 	github.com/tailscale/tscert v0.0.0-20220316030059-54bbcb9f74e2
@@ -76,7 +77,7 @@ require (
 	golang.org/x/text v0.3.7
 	golang.org/x/time v0.0.0-20220224211638-0e9765cccd65
 	golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2
-	google.golang.org/grpc v1.41.0
+	google.golang.org/grpc v1.46.0
 	gopkg.in/DataDog/dd-trace-go.v1 v1.38.1
 	gopkg.in/fsnotify.v1 v1.4.7
 	gopkg.in/yaml.v3 v3.0.1
@@ -111,7 +112,7 @@ require (
 	github.com/HdrHistogram/hdrhistogram-go v1.1.2 // indirect
 	github.com/Masterminds/goutils v1.1.1 // indirect
 	github.com/Masterminds/semver/v3 v3.1.1 // indirect
-	github.com/Microsoft/go-winio v0.5.1 // indirect
+	github.com/Microsoft/go-winio v0.5.2 // indirect
 	github.com/Microsoft/hcsshim v0.8.23 // indirect
 	github.com/OpenDNS/vegadns2client v0.0.0-20180418235048-a3fa4a771d87 // indirect
 	github.com/Shopify/sarama v1.23.1 // indirect
@@ -311,6 +312,7 @@ require (
 	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
 	github.com/yandex-cloud/go-genproto v0.0.0-20220805142335-27b56ddae16f // indirect
 	github.com/yandex-cloud/go-sdk v0.0.0-20220805164847-cf028e604997 // indirect
+	github.com/zeebo/errs v1.2.2 // indirect
 	go.elastic.co/apm/module/apmhttp v1.13.1 // indirect
 	go.elastic.co/fastjson v1.1.0 // indirect
 	go.etcd.io/etcd/api/v3 v3.5.4 // indirect