Add -logdir flag (#1039)

This allow configuring the various logs that may be outputted
(transcoder and future logs)

config/config.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"path/filepath"
 	"fmt"
 )
 
@@ -9,6 +10,9 @@ import (
 // DatabaseFilePath is the path to the file ot be used as the global database for this run of the application.
 var DatabaseFilePath = "data/owncast.db"
 
+// LogDirectory is the path to various log files
+var LogDirectory = "."
+
 // EnableDebugFeatures will print additional data to help in debugging.
 var EnableDebugFeatures = false
 
@@ -38,3 +42,7 @@ func GetReleaseString() string {
 
 	return fmt.Sprintf("Owncast v%s-%s (%s)", versionNumber, buildPlatform, gitCommit)
 }
+
+func GetTranscoderLogFilePath() string {
+	return filepath.Join(LogDirectory, "transcoder.log")
+}