Allow blobQuota to be configured

Previously, this was hardcoded to 5GiB but needs to be configurable for
Gitpod SaaS.

Author: Andrew Farries

install/installer/pkg/common/storage.go

@@ -93,6 +93,9 @@ func StorageConfig(context *RenderContext) storageconfig.StorageConfig {
 	}
 	// 5 GiB
 	res.BlobQuota = 5 * 1024 * 1024 * 1024
+	if context.Config.ObjectStorage.BlobQuota != nil {
+		res.BlobQuota = *context.Config.ObjectStorage.BlobQuota
+	}
 
 	_ = context.WithExperimental(func(ucfg *experimental.Config) error {
 		if ucfg.Workspace != nil {

install/installer/pkg/config/v1/config.go

@@ -142,6 +142,7 @@ type ObjectStorage struct {
 	CloudStorage       *ObjectStorageCloudStorage `json:"cloudStorage,omitempty"`
 	Azure              *ObjectStorageAzure        `json:"azure,omitempty"`
 	MaximumBackupCount *int                       `json:"maximumBackupCount,omitempty"`
+	BlobQuota          *int64                     `json:"blobQuota,omitempty"`
 }
 
 type ObjectStorageS3 struct {