support for remote tmate servers

command/daemon/config.go

@@ -110,6 +110,10 @@ type Config struct {
 	Tmate struct {
 		Enabled bool   `envconfig:"DRONE_TMATE_ENABLED" default:"false"`
 		Image   string `envconfig:"DRONE_TMATE_IMAGE"   default:"drone/drone-runner-docker:1"`
+		Server  string `envconfig:"DRONE_TMATE_HOST"`
+		Port    string `envconfig:"DRONE_TMATE_PORT"`
+		RSA     string `envconfig:"DRONE_TMATE_FINGERPRINT_RSA"`
+		ED25519 string `envconfig:"DRONE_TMATE_FINGERPRINT_ED25519"`
 	}
 }
 

command/daemon/daemon.go

@@ -144,6 +144,10 @@ func (c *daemonCommand) run(*kingpin.ParseContext) error {
 			Tmate: compiler.Tmate{
 				Image:   config.Tmate.Image,
 				Enabled: config.Tmate.Enabled,
+				Server:  config.Tmate.Server,
+				Port:    config.Tmate.Port,
+				RSA:     config.Tmate.RSA,
+				ED25519: config.Tmate.ED25519,
 			},
 			Environ: provider.Combine(
 				provider.Static(config.Runner.Environ),