feat: add vector integration

This currently is missing a few features:

- global sinks
- logrotation

But works fairly well otherwise.

plugins/logs/logs.go

@@ -6,6 +6,15 @@ import (
 	"github.com/dokku/dokku/plugins/common"
 )
 
+var (
+	// DefaultProperties is a map of all valid ps properties with corresponding default property values
+	DefaultProperties = map[string]string{
+		"vector-sink": "",
+	}
+)
+
+const VectorImage = "timberio/vector:0.11.X-debian"
+
 // GetFailedLogs outputs failed deploy logs for a given app
 func GetFailedLogs(appName string) error {
 	common.LogInfo2Quiet(fmt.Sprintf("%s failed deploy logs", appName))