Expose the authorized keys tmate feature (#18)

* Expose the authorized keys tmate feature
Described here: https://tmate.io/ in "Access Control"
The variable accepts the file content in raw format (with \n) and dumps it into a file which tmate reads
* Use echo instead of printf
* Add missing quote
* Only setup tmate settings if debug is activated

command/daemon/daemon.go

@@ -142,12 +142,13 @@ func (c *daemonCommand) run(*kingpin.ParseContext) error {
 				ShmSize:    config.Resources.ShmSize,
 			},
 			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,
+				Image:          config.Tmate.Image,
+				Enabled:        config.Tmate.Enabled,
+				Server:         config.Tmate.Server,
+				Port:           config.Tmate.Port,
+				RSA:            config.Tmate.RSA,
+				ED25519:        config.Tmate.ED25519,
+				AuthorizedKeys: config.Tmate.AuthorizedKeys,
 			},
 			Environ: provider.Combine(
 				provider.Static(config.Runner.Environ),