Add the first part of the build worker that runs on quay.

data/database.py

@@ -150,6 +150,13 @@ class RepositoryTag(BaseModel):
     )
 
 
+class RepositoryBuild(BaseModel):
+  digitalocean_build_node_id = IntegerField(null=True)
+  phase = CharField(default='waiting')
+  status_url = CharField(null=True)
+  repository = ForeignKeyField(Repository)
+
+
 class QueueItem(BaseModel):
   queue_name = CharField(index=True)
   body = TextField()
@@ -162,7 +169,7 @@ def initialize_db():
   create_model_tables([User, Repository, Image, AccessToken, Role,
                        RepositoryPermission, Visibility, RepositoryTag,
                        EmailConfirmation, FederatedLogin, LoginService,
-                       QueueItem])
+                       QueueItem, RepositoryBuild])
   Role.create(name='admin')
   Role.create(name='write')
   Role.create(name='read')