add google cloud storage

weed/command/scaffold.go

@@ -178,6 +178,7 @@ collection = ""
 ttlSec = 0
 
 [sink.s3]
+# experimental
 # See https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/sessions.html
 # default loads credentials from the shared credentials file (~/.aws/credentials). 
 enabled = false
@@ -187,5 +188,14 @@ region = "us-east-2"
 bucket = "your_bucket_name"    # an existing bucket
 directory = ""                 # destination directory (do not prefix or suffix with "/")
 
+[sink.google_cloud_storage]
+# experimental
+# see https://cloud.google.com/docs/authentication/getting-started
+enabled = false
+google_application_credentials = "/path/to/x.json" # path to json credential file
+projectId = "your_project_id"
+bucket = "your_bucket_name"    # an existing bucket
+directory = "/"                 # destination directory
+
 `
 )